hi Dave, i think there is some version of norman's rig as child or teenage guys... right here http://www.romanim.com/norman_database.php

Morpheus can be made into a child, too, and so is eleven, and if you need a more cartoony look, moom is good for that, too. Just scale the whole body down, and then scale up the head, the hands and feet (if possible) a bit.