Bullywug Berzerker

Amphibious. The bullywug can breath air and water

Speak With Frogs and Toads. The bullywug can communicate simple concepts to frogs and toads when it speaks in bullywug.

Standing leap. The bullywug's long jump is up to 20 feet and it's high jump is up to 15 feet, with or without a running start. 

Bloodcrazed Hunters. The bullywug berzerker has advantage on creatures with less than half their hitpoints. 

Multiattack. The bullywug makes two melee attacks one with greatclub one bite.

Greatclub. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 7 (1d8 + 3) bludgeoning damage. If the target has either taken no damage or is below half hitpoints deal an extra 1d8. 

Bite. Melee Weapon Attack: +5 to hit, range 5 ft., 1 target. Hit: 8 (2d4 + 3) piercing damage. On a successful bite regain hit points equal to half damage dealt, minimum 1.