Snot has the lowest currency value in Adventure Mode, Time Trial Mode, Challenge Mode and Virtual Tank Mode. When clicked on, it will give the player $1. Nostradamus is the only creature that drops Snot in the game.
Snot has an effect on hungry Guppies (when they turn green). If hungry Guppies eat Nostradamus' snot, they will turn into a Nostradamus. In virtual tank, if the situation mentioned before happens, the text "YUK!!!" will appear over it and disappear after a few seconds before the guppy dies.