The Clone Scout Walker functioned as a four-legged combat walker, deployed by clone troopers during the conflict known as the Clone Wars. A more heavily armored variant of the scout walker also existed.
For the launch of Star Wars: Episode III Revenge of the Sith, the LEGO Group produced a LEGO model of the AT-RT. Despite being named "Clone Scout Walker", it's important to differentiate it from the walker described above.