Amphibious. The grung can breathe air and water.

Poisonous Skin. Any creature that grapples the grung or otherwise comes into direct contact with the grung's skin must succeed on a DC 12 Constitution saving throw or become poisoned for 1 minute. A poisoned creature no longer in direct contact with the grung can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Standing Leap. The grung's long jump is up to 25 feet and its high jump is up to 15 feet, with or without a running start.

Spellcasting. The grung is a 9th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 12, +4 to hit with spell attacks). It knows the following ranger spells:

1st level (4 slots): cure wounds, jump

2nd level (3 slots): barkskin, spike growth

3rd level (2 slots): plant growth

Dagger. Melee or Ranged Weapon Attack: +5 to hit, reach 5 ft. or range 20/60 ft., one target. Hit:5 (1d4 + 3) piercing damage, and the target must succeed on a DC 12 Constitution saving throw or take 5 (2d4) poison damage.

Shortbow. Ranged Weapon Attack: +5 to hit, range 80/320 ft., one target. Hit:6 (1d6 + 3) piercing damage, and the target must succeed on a DC 12 Constitution saving throw or take 5 (2d4) poison damage.