Zul'rogg

Zul'rogg (or Zul'Rogg) is a forest troll warlord who was caught in the battle between Sylvanas' Forces and those of Varimathras in the Plaguelands.

A few of his tribesmen were attacked by Sylvanas's force and told her that their chieftain Zul'rogg would avenge them, if they were killed. Sylvanas would later personally encounter Zul'rogg, where he was surrounded by the rest of his forest troll forces.

Quotes mentioning Zul'rogg
Sylvanas: "Forest Trolls! I hate them even more than those cursed dreadlords. Slaughter them all!"

Forest Troll: "You'll never get us all, witch! Chieftain Zul'rogg will hunt you down and avenge us!"

Sylvanas: "He's welcome to try, savage!" - Sylavanas: "That brute must be Zul'rogg, the troll chieftain."

Trivia

 * His unit is named Zul'Rogg, but the forest troll's dialogue spells the name as Zul'rogg.

Speculation

 * While it was possible to take control of him by using a banshee, he does not appear in World of Warcraft. Sylvanas's hatred of forest trolls could have seen him killed. Alternatively, he could have been enslaved like Mug'thol and Blackthorn, but was killed by the Dreadlord Insurgents at some point during the war.
 * As the mission description mentioned the Plaguelands, it's possible that Zul'rogg and his followers were members of the Mossflayer tribe.