I don't think you need to bother wtih the freezer, unless it does something to the cannabis; butter keeps for so much longer than most people realize. I even keep a stick out on the counter so that I've always got soft butter (nothing worse than tearing up a good loaf of bread with hard butter). I think you'd be fine with just refrigerating what you've got.
Let me know how it turns out. I'm an alchemist at heart, and these cooking threads are now my new favorite hang-out area here.
