This could be nasal discharge. Puppies can become infected with kennel cough or other upper respiratory infections. It is also possible your puppy has a cleft palate and food/liquid is draining out the nose. Lastly if this is a very young puppy it could be regurgitation from the stomach if it has been given too much milk. This puppy needs to be examined by a veterinarian. Foamy, white discharge from the nose is not normal.
