UPDATE: I got a reply back from NORAD
Here it is!
Good day, Rob,
First, thank you for your interest in NORAD, and in how we track Santa safely into North American airspace.
I hope you know that Santa is only one of the millions of objects and aircraft that NORAD tracks over North America every year.
As your can imagine, our communications channels, including our pilots' "squawks" with Santa are encrypted and classified. For that reason, you won't be able to listen in as the pilots interact with Santa.
You have a good idea, though. May be we can work toward declassifying the Santa "squawks" in future years. So, keep on tracking!
Merry Christmas.
Royal Canadian Air Force | L’Aviation Royale Canadienne