Frog Lord

The Frog Lord bites but does not devour. He finds mail armour difficult to digest and anyway, his taste runs more to giant insects that to mammal flesh. Instead, he hurls intruders to his grotto against the cavern wall, breaking bones and tearing flesh and leaving their bodies to bleed and feed his parlour.

You may survive if you can crawl away. You may bind your wounds and mend your armour. You may slink off into the shadows or rise to arms and fight again. But beware the new moon and the first rays of a new crescent, for they will have power over you now, and your flesh will crawl and shift, your blood run cool, and when the ponds and streams of your homeland echo with the throb of amphibian throngs, you will hear them. You will hear them calling and you will itch for the feel of cold mud on your skin.

FROG LORD #1 AC 16 HD 4 Bite 1d12 and Tongue (Close range, dragged into Melee + Grabbed, Str contest resists, no action) 

Nat 19 Grabbed in teeth and shaken and flung: 2d6 on Toad’s turn, then thrown at nearby wall for 1d6.

S18 D12 C17 I3 P10 W14 Ch5 L7, Leap Close. Reac 2-5 Combative 6-8 Hungry 9-12 Languid.

Frog Lords are 9 ft behemoths, fat amphibians with lumpy skin, a great, toothy maw, and an evil intelligence. Their colouration runs the gamut of sickly greens and yellows and some exude a toxin onto the surface of their skin . When a victim survives the bite of a Frog Lord, they undergo a transformation on the next New Moon. Roll 1d3:

1: No physical transformation takes place, at least not externally, but the victim loses all sense of their humanity and retreats into wetland or at least muddy areas, submerging themselves as far as possibly in the cold slime and behaving, to all intents and purposes, like a frog. 

2: The victim transforms into a frog-like humanoid, gains the tongue attack of the Frog Lord and a bite attack. Can also leap anywhere within Far range as a move and leap over obstacles. Their bite can also pass on batrianthropy (a word I made up - shape-changing into a frog), if the victim fails a Luck (Con) save (each time bitten) but the victim always adopts the characteristics of 1, above.

3: The victim is transformed into a Giant Toad (ToA 201) with 3 HD and Bite 1d10.