Yes, you can reheat fried polenta. The most helpful way to do this is in an oven or a toaster oven. Preheat the oven to 350 degrees Fahrenheit and place the polenta on a baking sheet.  Bake for 10-15 minutes until heated through. You can also reheat it in a skillet over medium heat, occasionally flipping it until the polenta is hot and crisp.  If necessary, you can add a little bit of oil or butter to the pan to help keep it from sticking. When reheating fried polenta, make sure to watch carefully so that it doesn't burn.