Is there a trailer for bike that can pull another bike?

Yes, there are trailers available that can be attached to a bicycle to transport another bicycle. These types of trailers are often referred to as bike trailers or bike carriers. They can be used to carry a variety of items, including other bicycles, cargo, or even pets. Some bike trailers are designed to be towed behind a single bike, while others can be towed behind a tandem bike or a cargo bike.