Wormhead is a worm who fights in a worm arena in the official Blizzard scenario map for Warcraft III called Worm War. The worm is fed sheep and pigs from which it produces "segments" which follow it. These segments are covered in spikes. Fire elementals are also kept in the arena which might harm the worm. The worm can eat fire elementals with the help of a special item, and each fire elemental is worth 5 more segments.
Wormhead is a model of a nerubian crypt lord and makes all the voice sounds of crypt lord, as well as many new sayings voiced in standard crypt lord accent, "Welcome to Worm War", "Kinky", "Humiliation", "noob", etc. Each time it eats a worm it grows a smaller bug called a "segment" that follow the cryptlord wormhead. One of the worm's powerups is called "crypt craving", and allows it to suck down all sheep and pigs that are close to the "worm". Its basic skill, "Undying Hunger", allows it to eat the sheep and pigs.