Hmm good example of why people shouldnt mix species(not saying you did it purposely.). But so far you did a great job identifying them and seperating them I guess. Just take them to a vet. First off id seperate the salamander. And id quarantine that frog. So your other frogs dont get sick. Some frog/salamander tadpoles can act cannibalistic if not enough food is provided. Try providing algea waffers every 5 hours. Because tadpoles are constant scavengers. They are constantly eating. Like goldfish. J ust provide SMALL ammounts of foods. They should be fine. Good luck.