From Tekkenpedia

This move is currently lacking a video. Please wait for it to be uploaded and added. If you have a recording of the move yourself, contact a member of the staff to have them upload it for you.

Stonehead
Command	f,f+1+2 2+4,b (Kuma T2) f,f+1+4 (Kuma/Panda T3+)
Type	Front
Escape	2+4 (Kuma T2) 1+2 (T3+)
Damage	35 (T1-T2) 45 (Kuma, T2) 33 35 (Kuma/Panda)
Properties	Opponent can tech roll the throw
Move Frames		Escape Advantage
12

Stonehead, also spelled Stone Head on occasion, is a throw used in Mishima Style Fighting Karate. It has existed since the first game in the Tekken series and is used by all practitioners of Mishima Style Fighting Karate, with the exception of Jinpachi Mishima, and by Kuma/Panda. In the latter case, the move is called "Headbutt", uses the same command as Heihachi's Headbutt Carnival, and was not introduced until Tekken 3. In Tekken 1 and 2, one would need to press 2+4,b with Kuma.

Two variations of Stonehead exist. The before-mentioned Headbutt Carnival and the Devil Stonehead.