|Air date||December 28, 1989|
|Season||Season 21 (1989-1990)|
- Kermit the Frog goes to see his doctor, who listens to his heart. Describing what he hears as "groovy," the doctor sings "Heart of a Frog" about different kinds of noises (backed by frog nurses).
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|Episode 2648||Episode 2660|