Frozen turkey burgers can be cooked in the air fryer directly from the freezer. First, preheat the air fryer to 360 degrees F. Then, spray oil on the cooking surface of the air fryer. Remove the turkey burgers from the freezer and season both sides with salt to taste. Cook the turkey burgers in the preheated air fryer for 16 - 17 minutes, or until the burgers reach the internal temperature of 165 degrees. Flip the turkey burgers halfway through cooking.