Thats the thing, you can talk to practially every animal while wildshaped. Even to the Owlbear, which is techically not categorized as an animal. Just Halsin stays mute.
Huh! I attempted to talk to at least one animal (not Halsin) with my wildshaped moon druid and nothing happened so I assumed this didn’t work and stopped trying. Perhaps I’d actually come across a bug. I’ll try to replicate but don’t think I recall what animal it was.
Some animals problably have nothing to say...as some corpses.
Try the dog withe dead courier or the boar where you meet Astarion. "silver" in the druid grove also has dialogue. You can talk to the owlbear and even to the cub later in the goblin camp if you kill mommy. The Squirrels with the bard also have a funny dialogue...the bear with Volo too. Just to mention some
