Freezer bags are not designed to be used for boiling or cooking food directly. Freezer bags are typically made of plastic materials that are not suitable for high temperatures. If you try to boil or cook food in a freezer bag, there is a risk that the bag may melt or release harmful chemicals into the food.
If you need to boil or cook food, it's recommended to use bags that are specifically designed for cooking, such as sous vide bags or boilable bags. These bags are made from food-grade materials that can withstand high temperatures without leaching harmful substances. They are safe to use in boiling water or for other cooking methods.
Always check the instructions and recommendations provided by the manufacturer of the bags you intend to use, as different products may have different specifications and limitations.