Ive never had any luck with any of mine eating anything canned, I keep them around in case of emergency, weather too bad to get feeders etc. just in case but Ive never had any luck with them eating them.
I too have never tried anything in a can (dead). All of my geckos need to eat their mealies/superworms live and wiggling. If they don't wiggle, they'll stare at them for a while until they move. After that, CHOMP, CHOMP, GULP!:main_laugh: