The snyad (pestie) first appeared in the original first edition Fiend Folio (1981).
The snyad (pestie) appeared in second edition for the Greyhawk setting under the "mite" heading in the Monstrous Compendium Greyhawk Appendix (1990). The snyad appeared under the "gremlin" heading in the Monstrous Manual (1993).
The snyad (also called pesties) live in small passages adjoining dungeon corridors. The entrances to these tunnels are small and usually well concealed behind piles of loose stone, making them very difficult to detect. Snyads appear as small 2-foot tall humanoids, brown in color. They have long pointed ears and large bulbous noses. Their arms are long and spindly.