The Muppets Studio released its first iPhone app on December 15, 2009, Animal Drummer. The rhythm game featued Animal going wild on his drums; the player helps Animal tap out a rhythm.
Unlike the Sesame Street apps released by Sesame Workshop, the apps released by the Muppets Studio are available internationally.
The Muppets Animal Drummer -- Disney iPhone app(00:38)
Several other Muppet iPhone apps were announced at the 2009 D23 Expo, including "Gonzo Grams", "Pepe's Love Meter", and Statler and Waldorf Theatre". These apps were not released.
Pepe's Love Meter
Statler and Waldorf Theatre