Wow, Matt Vogel seems to take over a LOT of Muppets. Like Big Bird, Count von Count, Sweetums, Floyd Pepper, Lew Zealand... Though I think the best job he's done taking over an existing Muppet character would have to be Uncle Deadly, also a former Jerry Nelson character.
But besides that, if anyone ever wondered what it'd sound like if Jerry Nelson tried performing Kermit the Frog, now we'll know!