He's also canonically in the chain of causality that determines whether or not 9/11 happens in the Muppet universe. I don't know if that's a positive or a negative for the point being made.
2002's "A Very Muppet Christmas" is an "It's a Wonderful Life" style movie where Kermit temporarily wishes himself out of existence and is allowed to observe the resulting timeline. Shots of the Manhattan skyline in the main universe show no Twin Towers as expected, but there's a shot that clearly shows them in the background outside alternate Piggy's window. Wasn't an intentional bit of canon, just an little detail that arose from the set designers not realizing the Towers were in that old window backdrop they used, but the implication is hilarious