The Shopkeeper toon is called Loony Louis; he is a fat cream duck with a green shirt.
When you get a task for 'Hold 50 jellybeans' or 'Medium Pouch (25)' you are asked to fish four tires for one of Loony Louis' clown cars. Then he asks you to have Lucy Tires (Crack Up Auto Repair, Loopy Lane) to repair them. After a series of tasks, Lucy has you give the tires back to Louis.
Other than this major task, you earn 'Just For Fun' Toontasks from this shop.