Kyaromon

Kyaromon (キャロモン)
A Lesser Digimon that vigorously grew a tail. As it is brimming with curiosity, it takes an interest in anything, and has a habit of rushing for whatever caught its interest. The inside of its body has become mostly empty, and because it is elastic like a rubber ball, its "Shippo Swing", in which it puts its strength into its tail and strikes, seems to have the force to blow away even a Child Digimon.

Etymology
Kyaro: May come from kyaromu (キャロム), which translates to carom meaning (for a ball) to richochet.