I don't think anything is wrong, but you may want to keep an eye on him just in case he gets an impaction.

If given the chance, frogs and toads will eat nonstop and gorge themselves. It's like they don't have a turn off button when it comes to food. Maybe its instinctual, as in the wild frogs and toads will devour anything they can, for they don't know when their next meal will be.