If the kitten has just frozen to death, there is hope that it can be saved. If it has been frozen to death overnight, it may not be saved. However, it is best to give it a try to avoid missing the rescue and dying. It is best to wrap the kitten in a blanket and put it in a warm place. It is best to put a hot water bottle next to it. This way, the hope of saving the kitten is higher. It is best to move the kitten and help the kitten perform cardiopulmonary resuscitation.