Will blending corn meal make baking corn dog batter more user friendly?
I'm not sure about blending the cornmeal, though I would be interested to hear if it works, but if all you want is to try and keep the batter from falling off, you might try changing the hotdogs instead.  Hotdogs have a smooth texture, there's not a lot for the batter to grip onto.  You might try mechanically roughening the surface, using crisscross scratches or cuts, feathering cuts [as in kindling] on the outside, or something like that to give the batter some texture to hold on to.  Or cutting the hotdogs into chunks, so the batter can surround and more easily lift the smaller and lighter pieces - and it might be easier to portion and serve your corn dog cake.