Surfmac211,
I was taken aback too. I got my brick of Night Train and rubbed out the whole thing, then stuffed it tightly in Mason jars. I haven't had any problems. Personally, I think freezing tobacco will damage it at the cellular level -- and I think my opinion was formed by, if not completely owing to, G L Pease.
Also consider: the brick is so substantial that, if brought out of the freezer a good deal of moisture would condense on the exposed surfaces (unless you're in the desert.) There's a lot to consider here, and I say that if the Mason jar thing works, don't explore hazardous territory.