Bullywug Croaklord

Amphibious. The Croaklord can breath air and water.

Brute. A melee weapon deals one extra die of its damage when the royal hits with it (included in the attack).

Ramenos' Intoxicated. The Croaklord's attacks deal extra lightning damage while it is raining (included in the attack).

Frog Rider. The Croaklord has advantage on melee attacks made while riding a frog mount.

Speak with Frogs and Toads. The Croaklord can communicate simple concepts to frogs and toads when it speaks Bullywug or telepathically. 

Standing Leap. The Croaklord's long jump is up to 30 feet and it's high jump is up to 15 feet, with or without a running start.

Swamp Camouflage. The Croaklord has advantage on Dexterity (Stealth) checks to hide in swampy terrain.

Spellcasting. The Croaklord is a 3rd-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 14, +5 to hit with spell attacks). The Croaklord has following  spells prepared:
Cantrips (at will): lightning lure, thunderclap
1st level (3 slots): chromatic orb (lightning only), thunderwave
2nd level (2 slots): shatter
3rd level (1 slot): lightning bolt

Multiattack. The Croaklord makes three attacks: two with its lordly spear and one with its bite.

Lordly Spear. Melee or Ranged Weapon Attack: +6 to hit, reach 10 ft. or range 20/60 ft., one target: Hit: (2d6 + 4) piercing damage, or (2d8 + 4) piercing damage if used with two hands to make a melee attack. If the target is a Large or smaller creature, it must succeed on a DC 14 Strength check saving throw or be knocked prone.

If it is raining, this attack deals an additional (1d6) lightning damage.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: (1d6 + 4) piercing damage.

If it is raining, this attack deals an additional (1d6) lightning damage. A creature dealt lightning damage in this way cannot take its reaction until its next turn. 

Croaked Commandment (3/day). The Croaklord empowers his voice with the spirit of Ramenos. Each bullywug within 60 feet of the royal that can hear the commandment has advantage on its next attack roll.

The Sleeping God's Intoxicant (1/day). The Croaklord expunges a cloud of gas in a 15 ft. cube. Creatures inside must make a DC 14 Constitution saving throw or become poisoned for the next minute. While poisoned this way, any successful attack a bullywug makes against them is an automatic critical hit.