Henry Piggins is a pig who appeared on Sesame Street in a 2004 episode to help Rosita to speak without an accent. He starts off by having Rosita say the phrase, "The pig is big and did a wiggly jig." After many practices, Rosita still has her accent when she says the phrase, but Henry Piggins tells her that it takes time for her to say it correctly. However, Henry Piggins cannot continued the lesson because he has tickets to the play, "Pig-malion," and had to leave.
His name is a spoof on the character Henry Higgins, from the musical "My Fair Lady." "Pig-malion" is a spoof of "Pygmalion", the play the musical was based on.