I always kept Pupperonis (usually the little kind, although I could easily break up the long sticks if need be) around for the shelter dogs. They were ideal because the dogs went nuts for them and would look at the camera/the treat just behind the camera when I needed them to and because they were small, so I could keep feeding them treats and they would be gone pretty much instantly. So I could keep a pretty steady stream of rewards going and they knew I was good for it.
I used them for training tricks and specific behaviors for the same reason- you can quickly repeat trick/treat trick/treat without having to wait for them to chew.
They’re not doggie health food, admittedly, but I went through a LOT of them and usually spent my own money to get them, so cheap and easily available were big bonuses.
My own dog is not terribly treat motivated and likes greenies about as much as any of her treats. It’s toys she loves. And she doesn’t destroy them- just plays with them, which is all the more adorable with a white-faced senior. So it takes a LOT of restraint not to add a new squeaky stuffed animal to every grocery order just to see that tail wag. She loves the two that she has, though (monkey and llama) and it wouldn’t significantly enrich her life to have more. But maybe… you know… for special occasions.