Thanks for the reply regarding creature inspirations. Apparently, kobolds are goblin-like, and it was the illustration that lead to their current "reptilian" nature. Facinating stuff!
I actually like hyenas, so gnolls are one of my favorite humanoids. Sometimes I just wish they weren't quite so tough
I agree with the "true" troll being more exiting than the Scandinavian one. As per Chainmail, one could simply use ogre stats for those.
I have to say I've never heard of gorgons being described as bull-like, but like you say, I'm not into the medieval bestiary so much as ancient Greek mythology. The oldest description I know of is "dragon-like, with faces like hideous boars and snakes for hair". As for the hydra, I wasn't referring to the illustration, but rather it's description in Monsters & Treasure.
I've always loved those oozes, slimes and jellies. Great creepy fun!
Hope you had an wonderful Father's Day!