Place opossum in a large pot; add water to cover. Cover put and bring to a boil; reduce heat to mild boil and cook for 2 hours, or until opossum meat is falling off of the bone. Remove opossum, let cool and shred or chop the meat. Reserve tail for other use.
Mix together sour cream, mayonnaise, savory, salt and pepper.
Place the diced opossum in a bowl, add the peanuts and cranberries. Add juice from the squeezed lemon and toss well. Pour the dressing over the opossum and toss again. Serve immediately.