What are amphibians prey and predators?

Amphibians such as frogs and newts are preyed upon by many creatures such as; certain species of fish, mink, otters, herons...
Snakes and turtles are big predators of amphibians.
That depends on the amphibian, and the part of the world.

The most common predators are snakes, and birds like Storks, Herons, Egrets, Cranes, etc, but most Raptors and Acceptors, will also take them, as will Foxes, Badgers, and most carnivorous or omnivorous animals.
Turtles, Snakes, Racoons, Large Birds, other Frogs, Fish, and People.

Snakes