Well, sort of.
It's actually an "ooooooo" sound rather than an actual whistle, but he sure thinks he's whistling.
If he hears us or someone else whistling a little diddy, he rounds out those little lips into the perfect "o" & tries his hardest to let out a whistle.
He whistles around the house, in the car & all through the grocery store. And he does it so quiet & soft that it sometimes actually sounds like the real thing.
Real thing or not, it's stinkin' cute.