I think a part of it has to do with that the trolls were originally with hair, was influenced to live longer. The coneheads never was, and has the ability to shapeshift, until most of them got stuck. But they had surpassed the bodies ability to grow older, so to speak. Trolls were probably still beginning to go that way, first by becoming immortal, soom ageless... Until they rebelled. Back on topic, i wonder how come Magotty stuck to the same style for so many years. I'd love to see her in different designs and colors.