I like to ice my cakes while still frozen (buttercream). I have begun working with fondant and wanted to know if it is best to lay the fondant over a cake that has been dirty iced while it is still frozen or should I let the dirty iced cake thaw before putting the fondant on it? Thanks so much for any advice you can give!

I would let it thaw but be chilled, (for me anyways) fondant goes over cold, firm cake better. IMO the frozen cake my goop up the fondant as it's thawing(condensation) leading to color issues or worse, cake meltdown. Hope this helps!

I always do my crumb coat frozen and find by the time it's done, I've rolled my fondant and am ready to cover, it's thawed enough to cover. Have never run into condensation issues or anything.

I always freeze my cakes torted. Then I fill, crumb coat and then let them settle for at LEAST 2 hours before covering with fondant. This allows them to thaw and come to room temp before the fondant goes on. Works for me every time.

Good luck!