xenoptryx

No. Enc.: 0 (1d4 in lair)
Alignment: Chaotic
Movement: 60'/(20')
    Fly (120')/(40') for 1 round.
Armor Class: 7
Hit Dice: 2
Attacks: 2 (claws)
Damage: 1d4/1d4 + see below
Save: F1
Morale: 6
Hoard Class: None

A giant feathered bipedal frog with clawed wings and feet, the xenoptryx is thought a wizard's experiment that escaped into the wild.  It has a limited ability to fly for one round but must forego any attacks to do so, flapping it's arms furiously.  It may also fall safely any distance if it's wings are free.  In combat, the xenoptryx claws at it's prey using vicious wing claws.  If both claws hit, it kicks with it's rear claws like a cat, for two extra attacks causing 1d4/1d4.

and then... unlikely treasures

Roll 1d12 for the loot.

1. Armoured brocade tunic with mail panels of grey-green metal and nine purple gem buttons (6000gp) - Suitable for a tall human.  Weighs 20lbs, adamantine mail panels grant +3 to armour class and reduces damage from all attacks by 1 point. Purple gem buttons are amethyst (100gp each). 
2. Brooch of seven-rayed solar disk in rose gold and mithral filigree inlaid with seven yellow faceted gems (5500gp) - The gems are yellow topaz (worth 500gp each).
3. Coat of snow leopard fur (5000gp) - Suitable for a short human female; fit for nobility.
4. Diadem of platinum with triad of deep-blue gems over the brow (5000gp) - The gems are sapphire (1000gp each).
5. Engraved golden greatsword with ornate hilt of two coiled dragons with inlaid red gem eyes and iridescent orange-gold gem pommel (5000gp) - Weighs 12lbs. Blade is solid gold, worth 600gp and limited use in battle (-2 to hit, -1 damage).  The hilt is worth 2000gp, the dragons' eyes are four small red garnets (100gp each) and the pommel is a fire opal (1000gp).
6. Figurine of a knight riding a destrier bearing a spear and pennant in platinum (5000gp) - Weighs 25lbs.
7. Gold triptych of three sacred kings inlaid with opaque black gem panels sparkling with oily haloes in light (5000gp) - Panels are rainbow obsidian (worth 600gp if removed).  The triptych is worth 4000gp by weight.
8. Hunting cape of sable-trimmed panther fur and ornate gold dragon brooch with two small iridescent white jewels for eyes (5000gp) - Suitable for a tall human, fit for royalty.  The cape is worth 2400gp, the clasp is worth 2600gp.  The jewels are opals worth 500gp each.
9. Intaglio seal carved into a black jewel with yellow highlights set in a simple gold handle (5000gp) - The seal is carved into a faceted black sapphire and weighs 1lb. 
10. Jade cinerary egg engraved with ancient glyphs containing ashes (5000gp) - This ornate egg weighs 4lbs and is 3 inches wide and 4 inches high.  The ashes are of a serpent man hero (roughly 150 cubic inches of ash) and the glyphs record the names of their pantheon.
11. Kerchief of white brocade with silver wire hemmed with forty pink gems (4500gp) - Weighs 5 lb, is a three-foot square.  Each gem is a 100gp tourmaline.
12. Longsword of adamantine with ornate silver basket hilt inlaid with red gem (4000gp) - The hilt is worth 250gp and the gem is a 500gp spinel.

tesonke

No. Enc.: 1d2 (1d4 in lair)
Alignment: Neutral
Movement: 90' (30')
Armor Class: 5
Hit Dice: 3+1
Attacks: 2 (bite, tail lash)
Damage: 2d4/1d6 + see below
Save: F2
Morale: 7
Hoard Class: VI

The tesonke is a pony-sized carnivorous iguana with serrated spikes studding it's spine and radiating around it's tail.  They live in caves, coastal marshes and mangrove swamps.  A successful tail attack will knock down a man-sized or smaller foe who may not attack the same round this occurs.  Tesonke hide is used by locals as it creates a durable leather once the spikes are removed.

yet still more unlikely treasures

Roll d12 for the loot.

1. Bandolier of black dragonhide trimmed in leopard fur and dragon buckle in gold with red gem eyes (1200gp) - The buckle is worth 520gp and weighs 2lbs.  The eyes are garnets (100gp each).  The bandolier has 8 (empty) pouches.
2. Coat of silver fox with snow leopard trim and four blue-white ovoid gem buttons (1100gp) - Suitable for a tall human, fit for nobility.  Gems are cabochon-cut moonstones (50gp each) on silver wire settings (6gp each). 
3. Dagger of mithral with carved jade hilt and white pearl pommel (1000gp) - Weighs 1lb. Hilt is worth 275gp, pommel is worth 100gp.  Counts as a silver weapon.
4. Embroidered indigo silk robe with cloth-of-gold panels, blue gem-beaded sleeves and mink trim (1000gp) - Weighs 20lbs.  Beads are lapis lazuli (5gp each) and there are 50 on each sleeve.  Suitable for a large human female, fit for nobility.
5. Five identical ebony statuettes of horned men with carnelian eyes (1000gp) - Each is worth 200gp and weighs 5lbs, their eyes are 50gp each and ruin the statuettes if removed.
6. Gold statuette of a reclining succubus (1000gp) - Weighs 40lbs.
7. Head-dress made of a snarling winter wolf's head (1000gp) - Weighs 3lbs.  Bound to annoy any winter wolves or other wolf-friendly types.
8. Iron astrolabe (1000gp) - Etched with longitude, latitude and astrological markers.  Can be used to determine date and time at night under an open, clear sky in 1 minute.  Gives a +2 bonus to checks to avoid getting lost.  Weighs 6lbs.
9. Jet necklace on a fine gold chain (1000gp) - Weighs 3lbs.
10. Keg holding 10 gallons of sweet dessert wine (1000gp) - Weighs 80lbs.
11. Laboratory reagents and supplies (900gp) - Suitable for use in an arcane laboratory needed to cast certain spells or create certain monsters.  Weighs 30lbs.
12. Mirror of polished silver (800gp) - 4 feet by 18 inches. Weighs 24lbs.