Carl Marsh nicknamed Tonka is a fictional character. He is played by English stage actor James Corden. Carl is often referred as Tonka because he's fat.
Tonka's dad took Tonka to Darcy's boxing club because he wants him to be healthy. When Tonka was screaming in pain because Darcy through a ball at him all the members laugh and pick on him whitch makes Tonka livid and he tries to fight them. Tonka becomes Darcy's assistant and he enjoys spending time with the members.
Tonka is seen at the funeral and tells his family that he is going on a date later on.