YES YES YES YES. I cut my hunting teeth on squirrel hunting 50+ years ago, and man I still love hunting,shooting and EATING squirrels. I first brown them in a skillet in olive oil, sometimes with onions and green peppers, and then transfer them to the slow cooker. I put in one packet of lipton onion soup mix,a 1/4 cup of water and a can of cream of mushroom soup. Let it go about 4 hours on low and man you talk about a meal fit for a King. Also to sweeten the deal, throw in a package of frozen baby carrots and some red skin potatoes and let them cook right along with the squirrels, and you are good to go.
Tony