Before you reheat or cook crab legs, be sure to thaw them. Thawing crabmeat ensures that it will heat up evenly. You can defrost crab legs in the refrigerator overnight (for about 8 hours) or by running cold water over them. Once you've thawed and washed them, you are ready to heat them.
Yes, you can. Blue crab meat will stay healthy for consumption in the freezer for about 3 months. If you will be preserving your blue crabs for more than 3 months, they will still be safe for eating but the quality will have diminished.