Jungle Guys are relatives to Chuck Guys and Spear Guys. They are basically the varient that resides on Lavalava Island, specifically in Jade Jungle.
Jungle Guys are tribal Shy Guys that carry spears and wear red cloaks. They have odd markings on their masks. A Jungle Guy fights much like a Chuck Guy, but swings its spear instead of charging or poking with it.
Jungle Guys appear only in Paper Mario. It is unknown whether or not they have any allegience with King Bowser.