Looks like I have another wolf afficionado here
Actually, the kind of behavior your dog is making sounds more like a greeting to the other dogs, and it is a submissive greeting. Working with and observing the wolves at Wolf Park in college, I saw this sort of thing a lot! The submissive wolves will greet or "rally" to the alpha wolves by licking their faces. Other members will greet each other in the same fasion.
Catwoman is right about the puppies doing that to get food from the adults. This only occurs if the food source is far away from a den and the adults have to eat the food first to get it back to the pups. We didn't have any of that happen at Wolf Park since everyone was all together, so I would asssume your dog is simply greeting the other dogs