coffee beans are dessicated and so it's not exactly clear what is meant by "freezing" them, but yes, you can keep them in your freezer. Lower temperatures will slow down biochemical reactions, of course, but oxidation is your main enemy, so you need to make sure your frozen coffee is sealed airtight. the gold standard is to pre-measure the doses and that way you don't need to put coffee back into the freezer haver you have exposed it to more fresh oxygen by opening the container.

you can/should grind it directly from the freezer