I dont think that it would be worth it. Not feeding it a salamander wouldnt be that bad. Just stick with what you are feeding it cause The risk is not worth the reward.
kinda looks liek a red bellied newt if it didnt have the spot on its back (Carnivorous Vulgarous i think) i have one as a pet and they are toxic, they give off small traces of salmonella, not worth it lol...
Its much more cost efficient if you just feed tadpoles . . . . You can get bullfrog and leopard frog tadpoles from most bait shops. They are great and very high in protein. Plus are pretty easy to gutload since they eat just about everything.