Coat a jellyroll pan with cooking spray. Spread corn in pan. Broil 3 inches from heat 10 minutes, stirring occasionally. Remove from pan, and spread out to cool. Set aside.
Bring water to a boil in a 3-quart saucepan; add crawfish, shrimp, and crab boil. Return to a boil. Reduce heat, and simmer, uncovered, 1 minute. Add lobster tails; return to a boil. Reduce heat, and simmer, uncovered, 5 minutes.
Remove lobster tails, and place on a cutting board. Cut down center of lobster tails with heavy scissors; spread opening apart, and remove lobster meat. Coarsely chop lobster. Set aside.
Combine mayonnaise and next 4 ingredients in a medium bowl; add reserved lobster and corn, stirring gently. Split rolls to, but not through, bottom of roll; spoon about 1/2 cup mixture into each roll.