PLEAAAASE somebody post the Epic Tale of Throg as he tells it in Pet Avengers #1!
In the meantime, here is a good summary of the Frog Thor arc of 1986. Our Throg is Puddlegulp, who picked up a sliver of Mjolnir as Real Thor left, in hopes of fighting off the attacking rats, and became the new Frog of Thunder. (They're going with the 'cursed human' line in Pet Avengers.)