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Graugath (S."Demons, powerful and terrible creatures") were giant abominations--worse than trolls, most likely be linked to the race of Nameless creatures, being creatures that lived underground and no known Dark Lord ever tamed them. see:

Notes:

The storyline of Middle-Earth: Shadow of Mordor implies that Sauron used Graugs and lesser Trolls to breed the Olog-hai.