frog is dead :(

a few weeks ago i bought two dwarf frogs for my fish tank. they are totally submersible and dont need to breathe regular air like people do. well one died within the first week or so and was partially eaten by his tank mates. the other has persevered until...today. when he left his froggy legs in the mouths of his friends and went on to froggy heaven. i am an utter failure at raising dwarf frogs and now i will turn my attention back to my fish (and my children).