Does freezing a cake make it easier to frost?

I am making my daughter's birthday cake tomorrow. Boxed cake, going to cut it into the shape of a rocket, then frosting/decorating tomorrow. I made it tonight.. Is it easier to decorate when it is frozen?? Also, should I cut it before freezing then, or is a frozen cake easy to cut without the crumbling effect of a thawed cake??? Like cutting frozen chicken is easier than cutting raw chicken?? ANY advice is great!