marrow bones are awesome and you're right throw them in the freezer then hand them over makes teething pups and grown pups alike VERY happy but no need to boil them.
Extra double thanks.
I just found something that makes my senior Buddy happier than I have seen him since his brother passed. I had a frozen pack of marrow bones that were as yet uncooked. We just gave him one. I now have one very happy puppy.