"Call" is the breed. I think you are wondering the variety (color). I'm not familiar enough with Calls to even begin to guess. And, yes, they are way too young to sex at this point. Depending on the color variety, the drakes can color in differently than the hens. Drakes will also develop sex feathers, little curled feathers right in front of the tail. You should also be able to sex by voice; drake - raspy, sore throat sounding, hen - very loud, obnoxious quacks.