You wouldn't know it from cartoons, but there are various subspecies of whales and not all of them have square heads.
In cartoons, however, whales are usually drawn as blue/gray square-headed toothy creatures with wide mouths, halfway between a sperm whale and a baleen whale. Sperm whales in Real Life have the square heads you often see on cartoon whales, but their eyes aren't so close to their mouth like the baleen whale.
This is a common way to depict a Monster Whale or Space Whale. For stock cartoon depictions of other things see Stock Beehive, Stock Femur Bone, Stock Money Bag, and White Bunny.
Examples
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Advertising
- Fudgie the Whale, an ice cream cake design from the Carvel's chain is a cartoony whale with a square head.
Video Games
- Freddi Fish: Fluke the Whale in Freddi Fish and the Case of The Hogfish Rustlers of Briny Gulch is a blue whale with a square head.
Web Animation
- From Homestar Runner, there's the Drive-Thru Whale, mascot of the Blubbo's fast food chain, who resembles a blue sperm whale with large, flat teeth.
Western Animation
- SpongeBob SquarePants has Pearl, a gray whale with a square head. Justified since Word of God says she's a sperm whale.