Ok so my cakes are frozen. I know everyone says to thaw the cakes in their wrapping, but I plan on crumb coating while still frozen. So what should I do about letting them thaw before putting the final layer of icing on. Will the crumb coat help hold the moisture in ???

I usually fill and crumb coat frozen. Then I final coat, decorate the next night. Seems to work for me!

Just forget that they are frozen and work away. They just keep defrosting while you crumbcoat, fill, frost, etc. That is how I do it anyway.

After I crumb coat should I let it finishing thawing in the fridge???
Thanks so much for your help

It isn't necessary to finish thawing in the fridge unless you have a filling that needs refrigeration.