Lommy

Lommy Greenhands is a character in Game of Thrones. Although the character doesn't appear until the second novel, he debuts in the first season of the television series and is played by Eros Vlahos.

Lommy is an orphan living in King's Landing. He was formerly apprenticed to a dyer before being arrested for thieving.

In the books
In the Song of Ice and Fire novels, Lommy is a young recruit for the Night's Watch that Yoren meets in King's Landing. His forearms are dyed green from constant work..