Bert was, with Tom and Bill, one of the three trolls that captured Bilbo Baggins and the Dwarves during their eastward journey. During the fight with Thorin II Oakenshield, Bert received the end of a flaming stick in his eye.
Portrayal in adaptations
1982-97: Middle-earth Role Playing:
- Bert is a member of the Hugath tribe of Stone Trolls of the Trollshaw. In Hobbit lore he is known as "Bert Huggins", while his real name is Bûrat (perhaps intended to signify the rendition of his name in the Black Speech), also known as "Bûrat the Tongue". 
1995-8: Middle-earth Collectible Card Game:
- Bert is playable both as an Hazard Creature and as a Minion. The troll is also given the MERP variant name, Bûrat.