Gothmog the Half-Troll

Gothmog the Half-troll was the greatest of the Pertorogs and one of the most feared warriors in Sauron's service. He was the Warlord of the Host of Gorgoroth, Sauron's main Orc battle army, and served as the Witch-king's Lieutenant throughout the War of the Ring. During the Battle of Pelennor Fields, Gothmog led the Host that crossed the Anduin at Cair Andros and fell upon the city from the north. He later took command of all of the Mordorim after Eowyn slew the Lord of the Nazgul, and the foul Half-troll nearly achieved the victory his master had so long sought. Only the intervention of Aragorn II and the Army of the Dead prevented Sauron's armies from taking Minas Tirith.

Principal Items:

 * Skull-flail
 * Moon-axe

speculations
In the Movie Trilogy Gothmog is shown as a monstrous Orc.However it may be possible that this Gothmog was a Troll-Orc Crossbreed and can thus be considered a Half-Troll/-Orc.