Hi Ali,
This is one of those 'no right answer' questions :D It can come down to personal preference. When my dogs were puppies, I rarely gave them treats. Just never really thought it was good or necessary for them.
I did use & still use a type as training aids. My favorite for that is "Pupperoni" sticks because I can tear them into tiny bits & dole them out as a reward for good performance. Still, they do their obediance work because they want to & not soley for the goodie. But it does tend to speed up a long distance off leash return & Samma tends to focus on it/me & not on aromas carrying in the wind :D
When I leave the house for work or a while, mine get full sized pig ears.... they're small dogs & chew well before swallowing. I also give them Iams Lamb & Rice biscuits as a substitute. Occasionally they get a certain type of rawhide bone & they suck on that for the afternoon. Sometimes cow's hooves. That's about it. They have never had an interest in Kongs or nylabones.
When we are travelling, since they're doing a lot more exercise, sometimes they get a little human food like veggies & fruits when we're having our breakfast or lunch. They eat only once a day though. Samma turns into a little porklet if she eats twice a day, no matter the amount.
But this all works out for me & my dogs. You have to determine what is best for your situation & puppy..... likely through trial & error, just like we all do :D
good luck,
toodles