Delicious Cake
From Starfy Wiki
Delicious Cake (Japanese: おいしそうなケーキ) is an item in Densetsu no Starfy. Kanninpapa and Chibi-kannin trade it to Starfy in exchange for the Cute Stuffed Animal.
When Starfy gives it to the Zendama they become more colorful and have enough energy to battle the spiky enemies trapping Yakokagami.