This article contains lore taken from Warcraft III: Reign of Chaos, Warcraft III: The Frozen Throne, the manuals, and/or official bonus maps.
The Jungle Stalker from Warcraft III.
Jungle Stalkers appear in Warcraft III: The Frozen Throne within tropical climates. Going by the image, they resemble the various Sasquatch and Wendigo units in Warcraft III.
Note
The animated gif from the website is called "jungle beast".