The Pony Cart is in Saints Row 3, and only for one specific scene as you escape from the Safeword club. It is not pulled by ponies, they are pulled by people.
Before they are pulled apart they are called sister chromatids. Once they are pulled apart they are called chromosomes.
A two-wheeled vehicle pulled by a horse is called a cart.
This property is called ductility.
Santa travels in a sleigh pulled by reindeer.
Its called a carriage or if it is in a race on a track it is called harness also a gig.