Az-Harto

Ranger was an Olog-hai who was rescued by the Uruk Ratbag. Since then, they build up a reputation of being "The Etten", a two-headed troll.

Portrayal in adaptations
In Middle-earth: Shadow of Mordor Ranger is an Olog-hai who only speaks Black Speech. He can speak English but decides not to as he thinks it's a sin that Ratbag can't speak any of it.

As Ratbag is bad at almost everything, he doesn't even understand Ranger speaking Black Speech and thus treats him like he can't speak normally. As such, he decided to give him a nickname, dedicated to Talion. Thus explaining the name Ranger.

When Ratbag saved Ranger, he returned the favor by staying with him and protecting him. Together known as The Etten, they rose up to the rank of warchief and owned their own fortress. When Talion came in the picture to take over the fortress and kill The Etten he recognized Ratbag and became friends with Ranger.