Sneak Army

The Sneak Army (スニークアーミー) is a black version of Stealth Sneak that must be fought in the 34th and 4th seeds of the Hades Cup. Like Stealth Sneak, Sneak Army is a giant chameleon-like Heartless that's capable of turning invisible.

While it does appear in the first Kingdom Hearts, it is simply called a Stealth Sneak, and is only given a name and journal entry in Kingdom Hearts Final Mix.