Looking for input:

July 20th was my son's 1st bday.  I made too much cake, so one 8in round that is filled and frosted with buttercream is currently in my freezer.  It is wrapped in press and seal wrap and sealed in a plastic bag (we tried to get all the air out).

My older son's 4th bday is next week and I want to use this cake.  I've never used a frozen cake before.

What is the process of unfreezing to decorate?  Freezer to fridge (for how long) and then to countertop to cover with fondant and decorate?  Do I let it thaw sealed up or unwrap it to let it thaw?  Thaw it at room temp or in fridge?

i used a frozen cake once and I let it thaw at room temperature, but it wasn't frosted in buttercream....i hope someone else can answer because i would really like to know too!

I usually let them thaw at room temp.  I unwrap them and sit them back on a cooling rack.  I find that a 2" layer will be mostly defrosted in an hour, or so.