Need more information to really understand the scenario you're asking about.
But as a thought.
If you have a PDF file with only the "fronts" of the name tags.
You can have a workflow with the Insert Component. Select Type of: Job Pages, 1 insert, After each Page.
This will duplicate each page with a second copy of the same page: i.e. 1,1, 2, 2, etc.
Hope this helps. If not, please provide more info on what you're trying to do.
As a side note, I never understand why name tags are not always duplexed, as when hanging from a lanyard, they always flip over.
I have a variable data name tag that is to be printed with the same name on both sides, but they supplied the file with only 1 copy of each name. When I'm imposing them is there a way to make it print the same image on both sides so that once printed each name tag has their own name on the front & back?