Leadbelcher
From Warhammer - The Old World - Lexicanum
Leadbelchers are the Ogres that are armed with great hand cannons, imaginatively named leadbelcher cannons, absolutely addicted to the thunderous roar of a cannon and to the immense destruction caused by it. Fortunately, they are few in number, for they either gain them as a reward for great service from Chaos Dwarfes, or have to scavenge them from enemy artillery.
The alpha-males in charge of small groups of Leadbelchers are fittingly known as Thunderfists.