Sorry:
Crag-Crab Droid. They were in ROTS.
The continuing spread of the Clone Wars brought the conflict to new worlds of varied topography and climates. The Confederacy of Independent Systems responded by churning out new, more versatile droid designs that could combat the environment as well as the clone trooper forces of the Republic.
The crab droid's scrabbling legs offer it speed, agility, and the ability to climb over uneven terrain and even up craggy surfaces. Powerful servomotors drive its legs, overcoming the weight of its heavy armor plating. On Utapau, the crab droids served as a deadly threat against the clone troopers of General Obi-Wan Kenobi's attack battalions, though brave soldiers able to outrun its targeting sensors found weak spots behind the forward armor that could be exploited.