If anybody knows a tool that I can use to bulk crop the transparent pixels from lots of gifs I will give you my firstborn child. I have ~1000 pieces of pixel art archived from a defunct pixel doll dress up service, and they all have A LOT of transparency around them. They'd be more useful and aesthetically pleasing if I could present them without the transparent edges... But EZGif is unwieldly for a project this big.
I guess that ImageMagick might be the sort of thing you're looking for. Take a peek at https://usage.imagemagick.org/crop/#trim