I had to freeze a fondant cake for a month. I took off all decorations before I froze. As Mardie posted, wrap very well. When I took cake from freezer, removed all the wrapping, I placed cake in a cardboard box, lined with newspaper and a thin towel. This will help absorb the condensation. It will take several hours for the cake to thaw. Depends on how big your cake is. Minimum of 3-4 hours for sure. Fondant will be tacky, but eventually will dry out and harden again. Don’t touch the cake when drying out, or you will leave marks.
Creativity is God's gift to us. Using our creativity is our gift back to God. Clarky's Cakes 😎