Gumdrops are a food substance shown in IDFB.
Gumdrops are a jelly-like, trapezuim-shaped object that are edible. They can appear in many different colours, such as red, blue, dark green, green, purple, cyan, pink, yellow and orange.
It's A Monster (BFDIA 5d)
While they do not appear in the episode themselves, they do get mentioned in the credits, during the release date announcement for Episode 5e. The creators mention they will be willing to give up gumdrops to get the episode out on time.
The Long Lost Yoyle-city (BFDIA 5e)
Again, while they do not appear in the episodes themselves, they do get mentioned in the end credits, where the creators mention they didn't have to give up gumdrops.
Welcome Back (IDFB 1)
In Welcome Back, only two appearances of Gumdrops are shown, for the first physical appearance in the show.
In the beginning scene, team FreeSmart (including members Ruby, Pencil, Bubble, Book, and Ice Cube) are filming their video diary, as they were going to film themselves eating the Gumdrops they had collected over the years. This is short-lived, however, as Pencil realises that Ruby forgot to take the lens cap off the camera. Bubble explains to her what a lens cap is, but Pencil becomes distraught that they had been recording a black screen all this time for the past 3 years.
In another scene, Bubble and Ruby are shown eating the gumdrops in a rapid manner, while Pencil still is distraught over the diary.