They are still young. If I was you I would just take them back to the tree if you know which one it is and tell them the whole way get on that tree. As said above tie them up and pet and prasie them for barking treed. Make them tree for alittle while then If possiable show them the fur. Another thing you can do is if you have a older dog that will stay put. Tie the pups were ever you catch them and knock the coon out to the old dog and make them watch the show but dont let them in on the fun after a few times of this they will figure it out. If they were older dogs that started doing it I would say whip there butts telling them to get back on the tree but since they are pups let them be pups. They sound to me like they are off to a real good start. Dont want to ruin them.