Yes, you can eat cooked snails. In fact, they are a delicacy in many parts of the world. Snails are usually harvested from the wild, but they can also be raised commercially. They are often sold live in markets, or they can be purchased frozen. To prepare them for eating, the snails are first purged (forced to expel any dirt or grit), then they are cooked. The most common way to cook snails is to simmer them in garlic butter, but they can also be grilled, baked, or fried.