Well, toads can attack with their tongues, after all, it's level one. Poisonous bolt reed or moss? Doesn't sound good to me. Well, I agree, the swamp guardian isn't my best idea, but it's still an idea.

Added 4 minutes later
Level 5: thunderstorm lizard. An electrified giant swamp lizard. It attacks its target with its tongue, and an electric current passes through the tongue to the target, and if there is someone else standing near the target, the current passes to him (2 times weaker).
attack-------12
defense-----12
damage--------10-14
HP----------75
speed----4
initiative-7
growth-----3

Abilities: large, chain strike (maximum two targets).