Mooncap mushrooms appear when the Bad Moon arrives. They are harvested by Sneaky Snufflers, and have an intoxicating effect on any mobs of Night Goblins that are nearby.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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At the start of your movement phase, as long as it is not in close combat or fleeing, you can say that this unit is harvesting mooncap mushrooms. If you do so, it cannot move in that movement phase, but you can roll a D6. On a 2+, pick a friendly Night Goblin unit (of any type) within 6" of this unit. This unit gains the Frenzy special rule until the start of your next turn.