Mr. Austin Frothingslosh is Lady Tasha's next-door neighbor. He supposedly owns a cat, and is prone to saying "Great Caesar's ghost!" when surprised.
Mr. Austin Frothingslosh is primarily purple. He normally wears a brown coat, matching pants, a yellow dress shirt, a black tie, and brown shoes. When he leaves Mystery Manor, he puts on a trench coat and a brown muffler. In The Mystery of the Jeweled Eggs, he wears a black tuxedo, a white jabot around his neck, a monocle, and a top hat.
Austin has played Mr. Austin Frothingslosh in one episode of The Backyardigans: "Whodunit" from season two.