I don't know. I haven't had any lucid dreams at home. I bet the would only talk if you wanted them to. Because they are just DCs they would probably have personalities like you would think they would have.
Dreams are a art,you have to paint the path,to create a masterpiece.
I havent tried to talk to an animal or plant yet in a LD. I'll have to do that sometime. (I actually dont tend to have LDs with me in home, I seem to be any place else, usually places I dont know in real life).