Amphibious. The zombie frog can breathe both air and water.

Keen Smell. The zombie frog has advantage on Wisdom (Perception) checks that rely on smell.

Swamp Camouflage. The zombie frog has advantage on Dexterity (Stealth) checks while in swampy or aquatic terrain.

Undead Fortitude. If damage reduces the zombie frog to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie frog drops to 1 hit point instead.

Bite. Enter the description for your action.

Bite Melee Attack. Melee Weapon Attack: +4 to hit, reach 5 ft., 1 target. Hit: 7 (2d4 + 2) [necrotic] damage. The target must succeed on a DC 12 Constitution saving throw or be poisoned until the end of its next turn.

Tongue Pull. Enter the description for your action.

Action Ranged Attack. RangedWeapon Attack: +4 to hit, range 30 ft., 1 target. Hit: 4 (1d4 + 2) [bludgeoning] damage. On a hit, the target is pulled up to 10 feet towards the zombie frog, and the target must make a DC 12 Strength saving throw or be knocked prone.

Envelop. The zombie frog can attempt to envelop a Small or smaller creature it has bitten. The target must succeed on a DC 12 Dexterity saving throw or be restrained until the start of the zombie frog's next turn. While restrained, the target takes 7 (2d6) necrotic damage at the start of its turn. A creature restrained by the zombie frog can use its action to make a DC 12 Strength or Dexterity check (its choice) to escape.