There are several ways you can reheat palacinke or French-style crepes. Personally, I prefer to reheat them either in the microwave or directly on the pan. Know that you won't get the same result: if you want the crepes to be completely soft, then I recommend reheating them in the microwave (be careful not to heat them for a long time so they don't get soggy). If you want the crepes to have a slightly crispier edge, heat them directly on the pan: coat the pan with a thin layer of cold butter and heat on both sides. Do not reheat them for too long because they will harden and become too crispy. You can reheat thawed palacinke in the same way.