Froghemoth

Froghemoths are huge frog- or toad-like bipedal creatures armed with multiple tendrils replacing their front legs.

Description
Froghemoths are covered in green leathery hide with massive jaw six-feet in length, large tongues, extendable three bulbous yellow eyestalks at the top of their heads that have a 360° view of the surroundings, and four tendrils.

Bullywugs see froghemoths as gods and put their best efforts to providing them with food, fanatically protecting them from harm, and trying to ensure that any young froghemoth reaches maturity. They can communicate with one another by croaking.

Abilities
Froghemoths are amphibious creatures who can breathe air and water. They are resistant to fire and lightning damage. If the froghemoth takes lightning damage, it suffers several effects until the end of its next turn: its speed is halved, it takes a -2 penalty to AC and Dexterity saving throws, it can't use reactions or Multiattack, and on its turn, it can use either an action or a bonus action, not both.


 * Multiattack: The froghemoth makes two attacks with its tentacles, dealing bludgeoning damage and grappling a huge or smaller creature (escape DC 16).
 * Bite: A melee attack dealing piercing damage and swallowing a medium or smaller creature. A swallowed creature is blinded and restrained, has total cover against attacks and other effects outside the froghemoth, and takes 10 (3d6) acid damage at the start of each of the froghemoth's turns. The froghemoth's gullet can hold up to two creatures at a time. If the froghemoth takes 20 damage or more on a single turn from a creature inside it, the froghemoth must succeed on a DC 20 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, each of which falls prone in a space within 10 feet of the froghemoth. If the froghemoth dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 10 feet of movement, exiting prone.
 * Tongue: The froghemoth targets one Medium or smaller creature that it can see within 20 feet of it. The target must make a DC 18 Strength saving throw. On a failed save, the target is pulled into an unoccupied space within 5 feet of the froghemoth, and the froghemoth can make a bite attack against it as a bonus action.

Known froghemoths
A froghemoth lives in the garden of the Folding Halls of Halas, gathering a clan of bullywugs around it. When the Mighty Nein explored the garden, Nott noticed a slight opening behind the waterfall descending into a pool below. Using her Ring of Water Walking, Nott dashed across the pool toward the waterfall, but was caught short and swallowed by a giant froghemoth rising from the watery depths. Caleb cast Fireball, hitting the frog creature and several bullywugs emerging from the garden. In the fight Caduceus also got swallowed. Caleb had an opportunity to cast his new spell, Widogast's Web of Fire. Jester finished the frog creature off, which scared the frog-men away.

Trivia
While traveling through the Savalirwood, "Team Wildemount" of Bells Hells encountered a creature called a bog wretch. This creature was similar in appearance and ability to a froghemoth, using its stat block and tabletop miniature, but was mutated by the cursed woods and gain ability to teleport on short distances. When placing the mini on the game board, Matthew Mercer said that he was using the froghemoth as a "proxy" for the bog wretch.