I am doing a Nemo cake for Saturday and made MMF Nemo and Dori figures. Well I was impatient to finish them so I used buttercream to make the stripes and eyes, smile, etc. Then I got worried that the black icing was going to warm up and bleed onto my figures. (My shop is in a donut shop and when they are frying in there at night it gets really warm)
Since I have plenty of time to remake them I decided to freeze them. I have been searching for posts on here about what happens if you freeze MMF figures but couldn't find any. Anyway, I bringing them out later today and will see what happens.
Has anyone ever done this before? I would have NEVER tried it, but for the bad experience with the black buttercream in the past!
I've frozen MMF before... I highly recommend thawing it out in the fridge for a few hours vs out on a table because it will sweat more than in the fridge. You can look at my pictures and the "Tink" fairy cake... I had frozen that overnight... it did sweat a bit in the car ride for delivery, but it was ok... http://www.cakecentral.com/cake-photo_757573.html
Good luck!
I don't know about the MMF. With anything frozen your biggest enemy is condensation.
As for the black buttercream bleeding, I read in another post that adding meregine powder to dark colors (black, red, blue) will prevent them from bleeding. You could try that in the future for a little extra protection.
Okay, I pulled the out of the freezer right when I was ready to put them on the cake. I put them on, did the finishing touches, had to give Dori a better looking tail, etc. About 20 minutes out of the freezer I noticed that they were sweating, the black buttercream wanted to run green, cleaned that up waited, seemed fine. Put them in my 38 degree cooler. I think they are going to be fine! whew!
You can try putting them in a plastic bag when you freeze them next time. Keep them in the bad until they are thawed. The plastic bags help with sweating. I have frozen cakes that are covered in fondant and there is very little sweating if I keep them in the bag.
Post a picture of you figures. They sound cute!
I have trouble posting pics in here, here is the CC link
http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1058213
You can try putting them in a plastic bag when you freeze them next time. Keep them in the bad until they are thawed. The plastic bags help with sweating. I have frozen cakes that are covered in fondant and there is very little sweating if I keep them in the bag.
Post a picture of you figures. They sound cute!
I have done this too!..it does hel[ wt the condensation! 
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