He's also in An American Werewolf in London and sounds exactly like Fozzie Bear.

He's the check out jailer in the Blues Brothers (1980). He reprises the role in Trading Places and Blues Brothers 2k.

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Actually, I was just watching the outtakes on the Little Shop of Horrors dvd today(which I didnt know he directed) and kept thinking 'Why does someone keep doing a fozzie bear impression off camera'? Then of course I put two and two together and felt silly. He sounds a little different nowadays, but you're right about the similarities in the 80's at least.

He plays the Desk Sergeant in the Eddie Murphy/Dan Ackroyd comedy, "Trading Places".

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Or One could say that Bert and Fozzie sound like Frank Oz.

No way - they're more famous than him!
(Sorry, Frank.)
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I've heard him a little on the Documentary of the making of Star Wars Episode I
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Or One could say that Bert and Fozzie sound like Frank Oz.

i've talked to him before his voice is quite normal.

Well, okay, in the 70's and 80's, he sounded like Bert and Fozzie, but his voice has deepened and he doesn't sound like them anymore. That's what I meant to say.
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Funny, I don't recall that. I have heard him speak on a documentary about Sesame Street composer Joe Raposo, but that was several years ago. But I remember his voice as being pretty normal sounding. I'll have to clean the video and listen again, now that I'm older and more familiar with his characters.