Bossk - A Trandoshan bounty hunter in The Empire Strikes Back. He also appeared in the book Tales of the Bounty Hunters, the books of the Bounty Hunter Wars trilogy, in the story "The Prize Pelt", and in Star Wars: Empire at War: Forces of Corruption.
The bounty hunter droid was actually built from recycled film props. His head is the drink dispenser from the cantina scene in Star Wars: Episode IV - A New Hope. 58 Facts You Probably Didn't Know About The Star Wars Movies