I believe (and will confirm if I can be bothered to rush through disc 1 on my current play through) Norg to be evolved already. I believe this because Shumi either become a Moomba or an Elder. Well Norg shared many traits with the Elder of the village. He certainly didn't share many traits with the artisan ect. I'm pretty sure Norg evolved in to a Shumi elder but was just very very corrupt.