Yes when they start to grow legs they turn from vegetarians to carnivorous. They will eat each other if thats the only source of food they have. Carnivorous tadpoles will eat small bugs and other small animals.
Yes they do to survive if they can't find any other food
Yes if no food
Yes if there is no other food around
Yep the ones with back legs once they get them they turn in to complete meat eaters
Yep. If there isn't enough food for all of them, they will go cannibal.