Tyson isn’t particularly ticklish in general, but he appears even less ticklish most of the time.
Normally, Tyson is wound up too tightly to be effectively tickled, but once he’s convinced to relax properly, Tyson is laughably easy to break into waves of giggles.
Mostly it’s Tyson neck, ribs, and feet that are ticklish. His stomach and under his arms aren’t as easily effected.