I have an mobile concesstion stand that I have a fridge and freezer pluged in 1 outlet but my question is can I add an outlet outside the trailer so I can plug an extension cord to so I can power that outlet with the fridge and freezer to? Like an male to male connector or something?

If you want to electrocute yourself... thats a great way.

What you need is a recessed male twist and lock fitting for the outside... and a female twist and lock for the extension cord. That way your cord will never have exposed power you can come into contact with. And you can buy stuff like this in the electrical department of your favorite hardware or electric supply store.