Yes, you can eat the knuckle meat on snow crab legs. There's usually a lot of meat in the knuckle but it does take some effort to get it out. We usually eat the legs first and then take all of the meat out of the knuckles and eat that at the end. You'll be surprised how much meat there is! All you need to do is gently separate the soft shell and remove the chunks of crab meat. Be carefully not to get any pieces of the shell with the meat. The shell is softer on the knuckle but you still don't want to eat it.