Grung

Grung are excitable, small froglike humanoids found often in rain forests and tropical jungles. Similar to Goblins and Kobolds, some Grung have left their beastfolk tribes and attempted to adopt the mannerisms of humanoid society. All grungs are a dull greenish gray when they are born, but each individual takes on a certain colour as it grows to adulthood. Much of Grung society is a caste system, determined by colour.  From lowest to highest caste, grungs can be green, blue, purple, red, orange, or gold.
All grungs can secrete a substance that is harmless to them but poisonous to other creatures. Being amphibious, grungs require water to live; any grung that fails to immerse itself in water for at least 1 hour during a day becomes quite exhausted.