Hmmmm, never froze fondnat before. I think I would thaw slowly...maybe in frig over the course of a few days. Then bring it out.
Not sure though....
Jen 
I've frozen my left over fondant before. It works great. 
First I wrap the fondant in plastic wrap, then I wrap it in foil, and finally I put it into a zip lock bag.
When I want to defrost it, I leave all the wrapping on and set it on the counter to thaw. I don't unwrap it until it's completely defrosted. I've never had any problems, and it still feels the same way it did before it was frozen.
HTH
I froze extra fondant I had left over from another cake job. I pulled it out two days before I needed to use it and put it in the fridge to defrost. Then I moved it to the counter for the last 8 hours before use. I found it actually worked better than if I let it rest overnight. It was more pliable and didn't rip or crack. Good luck!
I froze extra fondant I had left over from another cake job. I pulled it out two days before I needed to use it and put it in the fridge to defrost. Then I moved it to the counter for the last 8 hours before use. I found it actually worked better than if I let it rest overnight. It was more pliable and didn't rip or crack. Good luck!
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