Staff photo / This pitch document for investors in a hydrogen plant in Arizona featured the principals in Rhino Onward International, an Illinois company. Two of them were Jonathan Frost and Paul Croft, also owners of the Croft & Frost accounting firm in Chattanooga. Croft & Frost's clients received no notice of the Chattanooga accounting firm's bleak prospects before it abruptly laid off its staff days before a key tax filing date, according to a new lawsuit that accuses the owners of malpractice."Rather Already a subscriber? Log in!