Plankenteenies are Nanodragons that look a bit like a plant root up close. Like all Nanodragons, Plankenteenies did not participate in the Dragon Rebellion.
Because their name sounds like "plankton", it might be assumed they function the same in the food chain - occurring in the billions and serve as food for other creatures.
- The Complete Book of Dragons: A Guide To Dragon Species, Cressida Cowell. 2014