Hi there....baby lizards of any type don't really brumate, just adults. Does your friend have access to care sheets ? There are some online. Most mountain horned dragons are wild caught so it may have parasites. They also need much cooler temps., and I've read that they do better with a water feature in their enclosure and high humidity. Ask him how he is set up + tell him to Google mountain horned dragon care. Hopefully the little guy will survive.