Amphibious. The knight can breathe air and water.
Speak with Frogs and Toads. The knight can communicate simple concepts to frogs and toads when it speaks in Bullywug.
Standing Leap. The knight's long jump is up to 20 feet and its high jump is up to 10 feet, with or without a running start.
Multiattack. The knight makes two Glaive attacks.
Glaive. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit:8 (1d10 + 3) slashing damage.
Croak of Charming (Recharges after a Short or Long Rest). The knight makes a loud croak while targeting one creature it can see within 30 feet of it. The target must succeed on a DC 12 Wisdom saving throw or be charmed until the end of its next turn.