The fireflies are small insects appearing on The Backyardigans merchandise.
The bugs' physical appearances vary. On promotional art, they have blue wings, gray heads, purple thoraxes and green abdomens. The firefly held by Sweet Dreams Pablo is mostly yellow and orange.
The insects have not appeared in any episodes of The Backyardigans, but appear on merchandise and promotional art. They are present on two illustrations (both included as part of the Spring 2008 style guide), as well as on the "Backyardigans Spring Mobile" printable from NickJr.com. A plastic firefly comes attached to the Sweet Dreams Pablo plush toy.