Hey Brent, yes you can! In the Forms designer tab, there is a red cross (delete form). This will delete the form from the list or library.
See here for more info Deleting Forms.
Is there a way of doing this without deleting the form or resetting it?
Basically, I published a form to show other users how it works. After some feedback I want to change it back to the original SharePoint form but still keep the Nintex form I created so I can make modifications to it.
If I have modified the list, made too many mistakes on the form and want to start a new Nintex form - how can I delete and create a new form which has all the standard controls from the columns in the list?