Ifound the answer to the question. ignore this. i don’t know how to delete a question.

it’s lava came from an explosive eruption

fkk you n*gga

fumikage isn't really a bird, and tsuyu does have teeth. tsuyu has a transformation quirk which still allows her to be partially human. otherwise we'd have a large frog running around. fumikage has teeth because again, he isn't a bird. his head was a quirk mixture if i'm correct.