Yes, you can make tasty hot dogs in your slow cooker. Many years ago I had a Rival slow cooker that was rectangular. I took my Sunday School class to the park one evening for a time of games and food. The small park by my house did not have grills but it did have a gazebo with an electrical outlet. I put hot dogs in my slow cooker and they were perfect. Several of the kids said they were the best hot dogs. I got the idea from this little booklet that came with my very first crockpot back in the 60s.
"Prepare hot dogs in the CROCK-POT - using no water! Just drop in the dogs (or Knockwurst, or Polish Sausage) and cook them in their own juice on High 45 minutes to an hour. In about one hour, the dogs will begin to 'brown' wherever they touch the sides of the pot."