For the Diablo II monster, see Treehead Woodfist.
Treefist Woodhead, Dumb as a Stump, is a Unique Dark Berserker that has a chance to appear on the 3rd level of the Halls of Agony. It is possible for Adventure Mode games to have a Bounty involving him.
In combat, he has Reflects Damage, Jailer and Frozen affixes.
The name of the monster appears to be a reference to Diablo II's Super Unique monster Treehead Woodfist.