In the first season episode "Don't Cry Over Spilt Milk," Doc realized that they had no specific name. Determined to give them one, he suggested "tromcordion," "foomaphone," and "pookarina." He also built a complex mechanized musical instrument out of several of them.
The noisemakers did not appear again until the final season episode "The Honk of Honks," in which Sprocket got one in his cereal box. Doc referred to it as a "swoopfoomer," indicating that this was the name he had ultimately settled upon. The swoopfoomer turned out to be a key component in the Honk of Honks.