In the second movie, Chomper made animal noises just like any of the other tyrannosauruses; but when he was brought back in later movies, he could talk and converse with the main characters.
Converse with the Unconscious: James keeps passing out/overdosing in the middle of conversations, which does not stop Michael from continuing to talk about himself.
You can converse with demons and successfully sweet-talk them into essentially selling themselves and join your forces, whether by literally bribing them with Macca or with an item exchange.