This sound effect can be found on Hanna-Barbera Sound Effects Library, which was made by Sound Ideas. It is a high pitched version of Sound Ideas, FROG - BULLFROG CROAKING, ANIMAL, AMPHIBIAN.
- Allegra's Window (Heard once in "Nest, Sweet Nest".)
- Olivia (Heard once in "Olivia's Day at the Office".)
- The Wiggles (Heard once in "Australian Birds".)
- Yo Gabba Gabba! (Heard once in "Green".)