Jammyfish

Jammyfish are enemies in Super Mario Galaxy and Super Mario Galaxy 2, they are stronger larger variants of Jellyfish. They don't really attack and they mores just stay in one spot. If you touch one, they will shock you. They can be found in the Bigmouth Galaxy and the Deep Dark Galaxy. To defeat a Jammyfish, you will need to throw 3 Green Shells at it. After it's defeat you will get a Coin. In Super Mario Galaxy 2, it has the same role as in the first game appearing in the Cosmic Cove Galaxy however this time, it only takes two shell hits to kill it and it releases Star Bits instead of a Coin.