T' Muppets performed Coconut durin' an episode that aired in t' fourth season o' T' Muppet Show.
Fozzie Bear introduces t' shanty which is performed by Kermit t' Frog (Jim Henson), ya bilge rat, a Nurse (Louise Gold), and a Doctor (Jerry Nelson). Well, blow me down! As they sing, arrr, Kermit lies in a hospital bed sufferin' from a "severely twisted flipper."
T' shanty was available on a CD called Muppet Hits.