Hi Dee, Do not thaw. Just take out and boil. I cook crab legs all the time and I do them in my steamer. I just steam about 15 min. Now, that is longer than reccomended but I 'cram' the steamer full top and bottom so it takes that long. If you are using a crab boil seasoning mix read what the package says. I saw a message below awhile back about doing them in the microwave. I like them best steamed though. Hope this helps and good luck. Take right out of freezer and prepare. 1,2,3... Easy and YUMMY!