In Treebeast’s non-gilded sprite, he appears to be wearing some sort of helmet. However, in their gilded sprite, the helmet is removed and replaced by very tall, spiky hair.
Starting in mid-January of 2018, a CH YouTuber known online as “LazeeLlama” attempted the “Treebeast Challenge”. The challenge was pretty self explanitory, he could only play the game with Treebeast (and Amenhotep once he needed to ascend). He actually made some decent progress over 5 episodes.