I'd think the salamanders would either be food, or be dicks. Tadpoles would most likely be food.
Maybe some Lemon Tetras, or other bigger than neons, smaller than Silver Dollar tetras might be in order..
So 2frogs, 2 3" salamanders , 1firemouth 1,1 bp and 3 tiger barbs? Already got the land part covered for the land critters. Sounds good? Everyone will be compatable?