Absolutely not. This is a common misconception that many people have. Tomatillos aren’t hot or spicy in any way. They’re used as the base for many sauces and salsas because of their quality. The spicy agents in such recipes usually include hot peppers or chilies of some kind. Tomatillos can be used in many recipes without altering the spice level, such as salads, stews, soups, and tacos. So if you have them on hand, feel free to use them because they will not be setting your taste buds on fire.