I'd think it could, since odors tend to be trackable on the ground (see: tracking by hound); However, I don't have scent, least of all (Ex) scent. Wildren do have both scent and a burrow speed, but their speed is only 10 ft. It'll be hard enough trying to follow at 20 ft.
Besides, I'm reasonably sure you can't get scent from Change Shape.