Tom and Jerry are a classic cartoon duo that have been around since 1940. They are two of the most iconic characters in animation, and their popularity has endured for decades. Tom is a grey housecat who is always trying to catch Jerry, a brown mouse. The pair's antics often involve slapstick comedy and physical humor. The term 'toon' is often used to refer to animated characters, making it an appropriate solution for this crossword puzzle.