Gleep

In one of its first appearances on The Ed Sullivan Show on Christmas Eve, 1967, the Muppet that would eventually become known as Grover is named Gleep. Like Grover, Gleep was performed by Frank Oz, however, his voice is a cross between Bert and Fozzie Bear. The puppet appeared in this form (colored brownish-green) during the early days of Sesame Street and was referred to as Fuzzyface.