"Can I just say that looks like it's going to be quite an easy fight," Norton said, as he laughed at the photo.
"It's the king of pies!"
"He must be a world class athlete but he doesn't look like one does he?" he added.
Read more: Joseph Parker vs Anthony Joshua likely to be announced this week
Joshua couldn't hold back a laugh himself and asked Norton whether "pie" should become Parker's new nickname.
"Shall I give him a nickname? Pie, the pie," said Joshua.
The heavyweight bout is expected to be confirmed within the next 24 hours and would reportedly take place on March 31 at Wales' Cardiff's Principality Stadium.