From Halopedia, the Halo wiki
Choppers are light scout and assault vehicles. Their design consists of a set of bladed wheels, behind which a driver’s seat is attached. The Chopper was originally created by Lighter Than Some during the Covenant’s first contact with Humanity on Harvest. Intended as a gift to be used as farming equipment, Jiralhanae mounted weapons to the vehicles and used them for combat. The name “Chopper” originates from their ability to tear apart enemy vehicles using their bladed wheels.
Baarug'qel Workshop Chopper used during the Second Ark Conflict
Early concept art of a Chopper for Halo Infinite.