Ridiculous linkbait title. It's a 6 legged John Deere (apparently by parent-company purchase) prototype machine, primarily developed for logging in difficult terrain. Looks remarkably steady and well designed, and it's discontinued. And AT-STs are the two legged ones, AT-ATs are the 4 legged.
AT-TEs are the 6-legged ones.
Those are from episodes 1-3 though, which my wife has dubbed "The Failogy". I don't acknowledge their existence.