Feeding a malnourished Firebelly toad?

[Hoppity100]

Now that I think about it, I don't know the history here: how long did owner have this frog or was it shipped this way or was it someone else's first? In any event, when a frog is getting thin to this point it needs help now. I check my frogs many times every day, as well as my other tanks. I feel bad when I see this. I feel bad when I see bettas stressed out in those little cups at all the stores and many are dying and the employees never notice! Same thing when I find hamsters without water. I've found hermits without water, too. I wonder about this frog.