Norm Huffnagel, seen on August 27, 2006, is the owner of an ice-cream truck.
He was seen after Nate Wright was trying to figure out who he thought was the greatest living American of all time. He shouted "Norn Huffnagel!" Because Nate loves ice cream proboaly.
Right when Nate was about to answer his best friend Francis Pope's question, he heard the sound of the ice-cream truck and decided to call Norm the greatest living man, probably because Nate liked the ice cream that Norm sold. Francis was very confused about Nate's answer. You can read it here https://www.gocomics.com/bignate/2006/08/27