I had a super easy surgery and recovery, too. Part of me worried they hadn't even done the surgery!
most people don't have any hunger for several weeks or months after the surgery, but some do. But like Tim said, it could also be head hunger or stomach acid. Do they have you on something like omeprazole? Most surgeons have their patients on it for 3-6 months after surgery. Thirst will also sometimes mimic hunger. I mean - it COULD be hunger, but it's more likely one of those other things.