kongs are a great tool to train dogs, especially puppies.
i agree that the peanutbutter stuffing is overrated and many people tend to give their dogs wayyyyy too much peanut butter, but the stuffing possibilities are endless.
it doesn't need to be a name brand kong tho, any hollow item that a dog can safely chew, and be left unsupervised with, serves the same purpose.
it's pretty incredible how well they work for training puppies, especially if they don't get any bowl fed meals at all for the first few weeks at their new home.