Your naturally wet skin allows you to maneuver through tight passages and avoid dangers. You have advantage on acrobatics checks when squeezing though tight passages and escaping grapples. 

You have a very long tongue that is dexterous. You may use your tongue as a whip. You may make sleight of hand checks to grab things with it.

Your Dexterity score increases by 2 and your Constitution score increases by 1.

Grungs mature to adulthood in a single year, but have been known to live up to 50 years.

Most grungs are lawful, having been raised in a strict caste system. They tend toward evil as well, coming from a culture where social advancement occurs rarely, and most often because another member of your army has died and there is no one else of that caste to fill the vacancy.

Grungs stand between 2 ½ and 3 ½ feet tall and average about 30 pounds. Your size is Small.

Your base walking speed is 25 feet, and you have a climbing speed of 25 feet.

You can breathe air and water.

You’re immune to poison damage and the poisoned condition.

Your long jump is up to 25 feet and your high jump is up to 15 feet, with or without a running start.

You can speak, read, and write frog, aquarian, and forest common.