Frees was a regular presence in Jay Ward cartoons, providing the voices of Boris Badenov (from "The Rocky and Bullwinkle Show"), Inspector Fenwick (from "Dudley Do-Right", impersonating Eric Blore), Ape (impersonating Ronald Colman), District Commissioner Alistair and Weevil Plumtree in "George of the Jungle", Baron Otto Matic in Tom Slick, Fred in "Super Chicken", and the "Hoppity Hooper" narrator, among numerous others.