The idea that Eastern hoggies can't thrive on mice has been proven untrue.
Unless you are willing to freeze all toads you intend to feed, for a month or longer, you are infesting your snake with parasites. My WC Eastern hoggy had so many different kinds of parasites that she had to be treated with an injectable antihelmentic as well as the usual oral dewormer. Plus, say you find a source of FT toads, or even live toads, now. There is no guarantee that that source is going to be available for the 20 or so years of the snake's lifetime. Maybe you'd consider a nice Western or Tri-color hoggy instead.