can you duplicate an entire form?

Yes, you can duplicate forms in your account or even a form from another user.

To clone an existing form in your account, follow this guide: http://www.jotform.com/help/27-How-to-Clone-an-Existing-Form

To clone someones form, here's a guide: http://www.jotform.com/help/28-Cloning-a-Form-from-a-Web-Page

If you need further help, do let us know.

Have a good one!