Not sure if this is possible but it did come to mind out of curiosity sake.
Assuming you have a $10000 loan for example.
You open up a 0% APR card for 15 months with a credit value of $15000 for example. You charge card via PayPal or some other 3rd party way and take the money from yourself to pay off the loan. Your loan is now in a credit card with no APR so you can pay it off without interest.
IS this a viable option?
EDIT: Seeing some talk below brought up this as a side question.
There are cards that offer $0 fees for transferring a balance over. But It thought that was just CC to CC. Can you actually transfer a loan to a credit card?