When I finish a drumstick or ham hock I use a flat thin bamboo stick from a Sushi roll mat to get the marrow out. It's delicious

Chicken is the most difficult, but it's high in Iron. Just break both ends off bones and extract the brown marrow. I toss the long parts in the freezer for making bone-broth and feed the knuckle ends to my dogs. Their eyes really light up when they hear that crrrraaack

Not much gets waisted round here!