Shelldon

Shelldon is a foe in Bloo Kid 1.

Description
Shelldon is a yellow snail with dazed eyes and a purple shell. If Bloo Kid tries to attack it, it will retract into its shell and eject spikes, preventing Bloo from attacking it for a period of time. In Bloo Kid 2, stomping them will leave their shells behind, allowing Bloo Kid to use them as soccer balls.

Green Shelldons
Green Shelldons looks similar to the purple one except except they lack spikes, leaving them very vulnerable.