Okay, in the interest of public safety I am going to respond to this post.
Yes, if you mean double barreled muzzle loading shotguns there are many companies that make them. The Cabela's catalog lists several and there are many more.
Before you buy one and start to use it thought might I suggest you do some research into how they function, the risks in using them, safety precautions and the best products and methods.
It is easy to lose an eye, thumb, hand-pick your body part-by not using muzzle loaders with due diligence.
Okay. There. Somebody replied.
The wolf is the pack-the pack is the wolf.