With his enormous mouth, cheerful eyes and frantic way of talking, Kermit always seemed like a cheerful frog. But Kermit’s personality appeared to change in recent years. At least that’s how Cheryl Henson, the daughter of Kermit’s creator Jim Henson, saw it. So last October, Kermit’s longtime puppeteer, Steve Whitmire, was fired from Muppets Studio.