Taste of pre-frozen lasagna
I have done this, and it seems to come out fine. 

Note, though, usually I will cook a lasagna almost all the way without a layer of cheese on top, and just put the top cheese layer on to melt in the last little bit of oven time. For this reason I freeze the unbaked lasagna without the top layer of cheese. I just mention this in case the freezer might do some harm to a top cheese layer (don't know if it will, just that I didn't try that experiment).