Mr. Novak is a real man who only appeared in "Walk Around the Block with Barney". He was mentioned in "Hi, Neighbor!" and "Five Kinds Of Fun!", but he does not appear.
Barney Wiki
Mr. Novak is a real man who only appeared in "Walk Around the Block with Barney". He was mentioned in "Hi, Neighbor!" and "Five Kinds Of Fun!", but he does not appear.