Monks choose a Monastic Tradition at 3rd level, and the

Way of the Water Lily is an a new option for the feature.

Way of the Water Lily

There is an old pond. A single frog jumping in. The sound of water. These images first inspired the ancient masters who devised the Way of the Water Lily. Having found serenity in the peaceful manner of humble frogs and lowly waterways, monks who walk this path are known for their reserved but wholehearted dedication to friendship and heroism.

Hop Along Beginning when you choose this monastic tradition at 3rd level, you learn to move as frogs do. Whenever you hit a creature with an unarmed strike, you can jump up to 5 feet without provoking opportunity attacks, as long as your speed isn't 0. You also gain swimming and climbing speeds equal to your walking speed.

Form of the Frog At 6th level, your body undergoes a significant shift, becoming as slippery and slimy as a frog's. You have advantage on ability checks you make to escape a grapple, and when you're hit by a melee weapon attack, you can use your reaction to reduce the damage you take from the attack by 1d10 + your Dexterity modifier + your monk level.

Soul of the Frog Starting at 11th level, your meditative trance becomes transformative. You can breathe both air and water. You also can cast the polymorph spell targeting yourself without providing any components, though you can only turn yourself into a Frog (Monster Manual pg. 322), and you retain your own Wisdom, Charisma, and Intelligence scores. Once you have done so, you must finish a short or long rest before you can use this feature again.