Olog-Hai in the New Line film
Tribe of Trolls living in Mordor. The Olog-Hai were bred by Sauron and possessed extreme strength. They could not speek, they could only grunt. Olog-Hai were used to do things like pull the gates of Mordor open for alliances to enter, carry the orc's heavy weapons, and throw bolders at their opponents. The Olog-Hai were not easily killed. Though they were slow and rather insipid, They had strong skin that was not often pierced. After fighting under Sauron, the Olog-Hai probably did not live in the Fourth Age.