Can i freeze chocolate cream frosting / ganache?
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!