This enemy has low health and attack. He attacks quite fast and his speed is quite good. You usually have many thrown at you at once, but they are still quite easy to defeat. Use a quick attacker like Rocker Cat to eliminate them quickly. For low-level players, use Cow Cat. Croco is usually a peon for stronger enemies.
This is just another weak enemy that requires no strategy. However, when they get spammed, just use an area attacker like Mr. or many Cow Cats. A Crazed Gross Cat'sShockwave can easily destroy groups of Crocos.