pf2e.fyi
From Pathfinder Howl of the Wild, which isn't enabled.

Frogskin Tincture

ITEM 6
Price 50 gp
Usage held in 1 hand
Bulk L
Category elixir

Activate (manipulate)

Once you imbibe this bitter elixir, your skin exudes a toxin for 1 hour, affecting any creature that hits you with a jaws Strike or other bite attack. If you are Swallowed Whole by another creature, they are automatically exposed to the poison every round and take a –2 penalty to their saving throw against it.

Frogskin Tincture Poison (poison)

Saving Throw DC 22 Fortitude
Maximum Duration 6 rounds
Stage 1 2d4 poison damage (1 round)
Stage 2 2d6 poison damage and Enfeebled 2 (1 round)
Stage 3 3d6 poison damage, Enfeebled 3, and Sickened 1 (1 round)
Pathfinder Howl of the WildORC