Placing burned cookies in the freezer will not reverse the effects of overheating. However, if the cookies are only slightly burned or have developed a dark crust, you can try scraping off the burnt portions with a knife or grater. This may help salvage some of the cookies, but it won't completely restore them to their original state.
To avoid burning cookies in the future, it's important to monitor them closely while baking and follow the recommended baking time and temperature in the recipe. This will help ensure that the cookies are cooked evenly and not overdone.