Puree 1 1/2 cups cantaloupe chunks and 1 tablespoon orange juice in a blender. Divide the mixture between pop molds or 3-ounce paper cups. Freeze until the top becomes firm, 30 minutes. Rinse the blender, then puree 1 1/2 cups honeydew chunks, 1 tablespoon thawed limeade concentrate, and 2 mint leaves. Remove the molds from freezer and top with the honeydew mixture. Cover and freeze.