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.
Dagger. Melee or Ranged Weapon Attack: +4 to hit, reach 5 ft. or range 20/60 ft., one target. Hit:4 (1d4 + 2) piercing damage, and the target must succeed on a DC 12 Constitution saving throw or take 5 (2d4) poison damage.
Grungs are aggressive frog-like humanoids found in rain forests and tropical jungles. They are fiercely territorial and see themselves as superior to most other creatures.