get-to-it-lipreaders

Is Onion deaf/hard of hearing? because he doesn’t have ears, doesn’t speak English, and in bubble buddies he didn’t understand Steven when he was telling him to shoot the bubble with the harpoon gun. I mean he seems to understand most things p well but it could be that he’s just really good at lipreading but the bubble was getting in the way. also how does he communicate with his dad bcuz he doesn’t seem to use sign language (also yellowtail doesn’t speak, look at sour cream). if they’re both deaf that might be part of why yellowtail doesn’t want Sour Cream to be a DJ– he can’t hear the music.