Modded entities do work with the mod, but for some reason it seems to be impossible to do it in survival mode. Ive tried this mod with quark and alex's caves and havent been able to get it to work in survival.

Aggressive entities won't follow survival mode players, which entities are you trying to use it with?

I was attempting to get crocodiles to follow me from the alex's mobs mod, which is a neutral mob, but it wouldnt let me do it survival. Is there a way to turn this off so hostile mobs can follow me?

Not with just follow me itself, you would need something to prevent the entities from targeting the player, as that's the condition for stopping the following.