Frazzle's Dad is Frazzle's Dad. He appears in the book Frazzle's Fantastic Day. In the book, he is seen at the breakfast table with Mrs. Frazzle. He doesn't speak, leaving the discipline of Frazzle's actions to his mother.
Unlike Mrs. Frazzle, there are no known appearances of Mr. Frazzle on Sesame Street, nor any other illustrated appearances.