S.S. Peppermint

The S.S. Peppermint is a treasure in  located in the Hero's Hideaway. It is a mint-flavored with a cyan chocolate-mint buttercream filling, with star and beaded sprinkles on the bun.

Hero's Hideaway
There is an S.S. Peppermint on a ceramic plate next to an S.S. Chocolate on the kitchen table on the northern half of the Hero's Hideaway. To collect it, you must throw 3 Pikmin at it.

Cavern for a King
There is an S.S. Peppermint inside of a Blizzarding Blowhog in the northeastern corner of sublevel 7 of the Cavern for a King. To collect this treasure, you must first defeat the Blizzarding Blowhog, then throw 3 Pikmin at it.

Trivia

 * The S.S. Peppermint closely resembles the macaron worn by Blue Sweetshop Decor Pikmin in Pikmin Bloom. It is also very similar in appearance to the blue team Victory Macaroon from Bingo Battle mode in Pikmin 3.