Can i freeze chocolate cream frosting / ganache? I made some chocolate cream frosting / ganache (basically just double / heavy cream with plain / bittersweet chocolate, melted and whipped up). 

I ended up with twice as much as I need. Can I freeze it or will I simply have to eat it all (oh, the hardship)?
You may absolutely freeze chocolate ganache and most other chocolate preparations.  It should keep for up to a year without any noticeable change in quality.

Try to get a tight seal so it doesn't pick up other freezer odours.  Use a small freezer bag if you can, and maybe put that in a hard sealable container as well.  The freezing itself won't hurt the ganache at all but if it catches a whiff of those tuna casserole leftovers then you won't want to use it!