Can I freeze cake pops already in ball form or am i better off freezing the cake and frosting separate? Also can you freeze buttercream?

Yes you can freeze buttercream. I don't know about cake pops.

You can freeze both. If you're making cake pops, roll them into balls, set them on a sheet tray and place them in the freezer until they're frozen. An hour should probably do the trick to make sure they keep their shape. After that, you can put them in a freezer bag.

Just be sure to let the balls thaw completely before you dip them or your coating will crack.