Cheep Cheep Coin
From the Super Mario Wiki
A Cheep Cheep Coin is an item in Puzzle & Dragons: Super Mario Bros. Edition that allows the player to transform Cheep Cheep-type enemies into stronger forms. Cheep Cheep Coins can be obtained by defeating Cheep Cheep-type enemies or by winning them in the Lucky ? Blocks game in Toad Houses.
Transforming enemies into stronger forms require a certain amount of Cheep Cheep Coins. Transforming a Red Koopa Troopa into the enemy "Red Koopa Troopa & Cheep Cheep" requires three Cheep Cheep Coins. A Blooper can also transform with Cheep Cheep Coins into the enemy "Blooper & Cheep Cheep" with three Cheep Cheep Coins, and can be transformed even further to "Blooper & Cheep Cheeps" with six more.