I do! I even use kibble as low reward treats. It's cheaper and with the amount they get I feel better than them getting an equivalent amount in hot dogs, cheese, or other typical training treat. For when a higher reward is needed, like when I'm redirecting their attention from another dog or rewarding them for voluntarily ignoring a strange dog, I use dehydrated chicken pieces.
I like the idea of baked sweet potato pieces. My dogs get so little carbs in their diets that I think they'd be able to handle a few of those with no problem. I'm goona try some and see if they like them!