It is not advisable to cook bacon in its frozen state. It is always better to defrost any meat before cooking it because frozen meat takes longer to cook and might not cook evenly as compared to a defrosted bacon. Frozen bacon when cooked seldom becomes crispy as it releases a lot of water. If you do not have any time at hand you can cook frozen bacon by slicing it horizontally with a sharp knife. Then place the pieces in a skillet for cooking. It will separate into lardons and cook evenly.