(This is Actually More Of A "Theory" Than A Headcanon)
Why Branch And Floyd Have Curved Ears:
As We Could See From The Brozone Flashback, Branch And Floyd Used To Have Ears That Were "Rounded" Like The Other Pop Trolls... My Theory Is That When Branch Was Grey And Sad, He Was Constantly "Drooping" His Ears Down. And It Might Have Caused A Physical Deformity That Gave Him His permanently "Curved" Ears. 👂 Since Floyd Is The Sensitive One, He Most Likely "Drooped" His Ears Down A lot Too.