Also, geo-thermal heat sources, like hot springs, could be used by Trolls for cooking and even metal working.
Gary R Switzer
Aero Hobbies
"The Trolls of Gashskull, who live between the Lakes of Nok and Natch, have an interesting method of keeping their food trollkin well fed. Any sort of foodstuff that can be got easily or cheaply is thrown into a hot spring to form a sort of stew or soup. Humans cannot eat this, due to the many strange minerals disolved in the water. The Trolls, however, claim this gives their trollkin a unique flavor."
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