Amphibious. The frogrince can breath air and water.

Standing Leap. The frogrince's long jump is up to 20 feet and its high jump is up to 10 feet, with or without a running start.

Lightning Reflexes. The frogrince has advantage on dexterity saving throws.

Frogs Curse. Any creature that kisses a frogrince must succeed on a DC 14 Wisdom saving throw, charmed creatures make the saving throw with disadvantage, one a failed save the creature is turned into frog until a 5th level Remove Curse is cast. 

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) piercing damage, and the target grappled (escape DC 11). Until this grapple ends, the target is restrained, and The Frog Prince can't bite another target.

Swallow. The frogrince makes one bite attack against a Small or smaller target it is grappling. If the attack hits, the target is swallowed, and the grapple effect ends. The swallowed target is blinded and restrained, it has total cover against attacks and other effects outside the frogrince, and it takes 3 (1d4) acid damage at the start of each of the frogrince's turns. The frogrince can have only one target swallowed at a time, if the frogrince dies the swallowed creature is no longer restrained and can escape from the corpse using 5 feet of movement, exiting prone.

Charming Presence. Each creature of the frogrince's choice that is within 60 feet of the frogrince and can visually see it must succeed on a DC 13 Wisdom saving throw or become charmed for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. if a creature's saving throw is successful or the effect ends for it, the creature is immune to the frogrince's Charming Presence for the next 24 hours.