Can you use expired cool whip that was frozen?

I suppose that would depend on how long it has been in the freezer. If it's been there for over a year, then it might just be worth it to go buy a new one.

However, it should be completely fine to use. Even meat, when frozen, can be thawed and consumed within 6-12 months after its normal expiry date.

So, I wouldn't be worried. :)