Marrow Sucker

Marrow Sucker was the name of a Laistrygonian giant who (along with Skull Eater and Joe Bob) was part of a group of giants that infiltrated Percy Jackson's school in The Sea of Monsters, the second book of the series, posing as visitors from Detroit.

The Sea of Monsters
While undercover, they joined a dodgeball game with the class bully, Matt Sloan, during which they transformed into their true forms and attempted to kill Percy using flaming celestial bronze dodge balls. Marrow Sucker participated in this battle, but is defeated and eventually killed when Tyson begins to toss the flaming dodge balls back at him.