The Cake Golem is a utility mob. It is similar to the iron golem in appearance, but with a cake as a head, and a matching body. It has only 20 health, despite its large size, and it does 5 damage. The cake golem takes constant damage from water, similar to a blaze.
Cake golems cannot be built, unlike other golems such as iron, snow, or coal golems. Instead, they spawn in villages, but only on one day of the year: The First of June. This is the birthday of Notch. This is similar to holiday features, like hostile mobs spawning with pumpkins on their heads in Halloween, or chests getting a gift box texture for Christmas.