[C] Revenge: 20+
If any of your Pokémon were Knocked Out by damage from an opponent’s attack during his or her last turn, this attack does 70 more damage.
[P][C][C] Poison Jab: 60
The Defending Pokémon is now Poisoned.
The croaking that Toxicroak produces before a battle is for churning the poison it has stored in its poison sac.