2. Frozen crabs bought from supermarkets are generally edible, because when they are live crabs, they are quickly frozen to die, and then stored in an environment of MINUS 18℃. In such a low temperature environment, bacteria will not breed too much; However, if crabs are frozen to death in the refrigerator at home, it is recommended not to eat them, because the low temperature environment of the refrigerator at home is unstable and it is difficult to judge how long the crabs have been dead. It is recommended not to eat them.