I am playing this mod tied into the Deceased craft Mod pack through Curseforge. I am heavily struggling because I cannot find a chameleon or goats within this mod. There is almost no information on chameleons out there nor in the game achievements / quests / GUI. Can someone see if there is an issue with it inside the Deceased craft Mod pack or some specific biomes that they can be found in?

Hello, not the creator here but ive found them in jungle biomes in the pack im playing, we dont have the deceased mod pack but id recommend checking there!

There is plenty of information about them on the dedicated wiki that's right here on the GitHub page:
https://github.com/Momo-Softworks/Cold-Sweat/wiki/Chameleon