To use as both familiars and and imps I'm using some old Wood Elf sprites from Games Workshop. The frog is also the perfect familiar for my witch. I don't know where the model is from, but it's metal and was in my bit box.
This bound minor demon is a resin faun model from Admiralty Miniatures. It's part of a bigger set of Chaos Dwarfs, I've used for a warband as well.
The band of demons that can get summoned in the game. The big green guy is an old Winged Nightmare from Games Workshop. He has since been a beast of nurgle in blood bowl, before now being a demon in Frostgrave.
The red minor demon is a Loka chess piece by mantic games. The imps are a plastic squig from Battle for Skull Pass. The other imp is a gnoblar with an added ungor head.