From the Super Mario Wiki
Raspberry is the name given to the bottom half of Bundt, similar to how Exor's mouth is named Neosquid. Of course, like Bundt, it appears in Marrymore in Super Mario RPG: Legend of the Seven Stars. Raspberry is the weaker part of Bundt, it has lower HP, yet its attack is higher. It is also capable of different attacks, sharing the same weaknesses and strengths.
When Mario and company fight Bundt, the top half goes first and it is then and only then that Raspberry will be able to attack. After the heroes defeat Raspberry, Booster orders his minions Snifits to take the monstrous cake and eat it up, ending the battle and Princess Toadstool's wedding.
Names in other languages