Morgul orcs

Morgul orcs were some of the bravest and lesser Orcs in Sauron's battalions.Their leader was Gorbag,who was killed at Cirith Ungol by Shagrat's Black Uruk patrol.Thousands of them united with Morannon orcs,Easterlings,Trolls and Southrons to form Sauron's largest host to shatter Minas Tirith by the Siege of Gondor.But hundreds of them were killed by their own Mordor orc bretheren over Frodo's Mithril shirt.Eventually shagrat brought the Mouth of Sauron the shirt and told the authorities of Barad-dur that some rebel Morgul orcs were on the loose since some escaped the pass of the spider.

In the ROTK movie,a morgul orc clubbed an Uruk in the back of the head with a turkey leg at Cirith Ungol.