pf2e.fyi
From Pathfinder Society Scenario #1-04: Bandits of Immenwood, which isn't enabled.

Frog Swarm

CREATURE -1

Swarms of centipedes are dangerous indeed, ravenous carpets of skittering hunger capable of devouring a traveler whole in a matter of minutes. Some alchemists submerge whole centipedes taken from swarms in their elixirs and some mutagens, claiming such infusions increase potency, though other say this is nothing more than quackish claptrap. Kobolds and mitflits are both known to incorporate swarms of centipedes into cunning traps, from simple pits filled with vermin or more complex affairs involving chutes that dump the vermin onto the heads of unwary intruders.


Perception +5; low-light vision
Skills Acrobatics +4 (+8 to jump)
Str -2, Dex +3, Con +1, Int -4, Wis +1, Cha -3

AC 13; Fort +2, Ref +7, Will +4
HP 12; Immunities precision, swarm mind; Weaknesses area damage 3, splash damage 3; Resistances physical 6 (except bludgeoning)

Speed 30 feet, climb 10 feet
Distraction

Any living creature within the area of a frog swarm must attempt a DC 12 Will save. Humanoids that fail this save are Stunned 1 (Stunned 2 on a critical failure). Animals are Frightened 1 on a successful save, Frightened 2 and Fleeing on a failure, and Frightened 3 and fleeing on a critical failure.

Pathfinder Society Scenario #1-04: Bandits of ImmenwoodOGL