The Firegut ogres of the Burning Steppes are allies of the Blackrock orcs. They work closely with those orcs, keeping the mineral rich Dreadmaul Rock guarded and the supply lines open at all times.
For a short time they were led by Gor'tesh until he was killed. Gorlop leads the clan currently... until he fell into lava.
All Firegut ogre mobs have [Flamestrike] as a racial ability.
In the RPG
The Fire-Gut are led by Chief Ogg'ora and make their home in Fire-Gut Rock in the Burning Steppes.
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Considering their mound is called Dreadmaul Rock, they could have been a part of the Dreadmaul tribe from Blasted Lands.