Ancient Crystal Toad

Amphibious. The Ancient Crystal Toad can breathe air and water.

Innate Spellcasting. The Ancient Crystal Toad's spellcasting ability is Wisdom (spell save DC 12). The Ancient Crystal Toad can innately cast the following spells, requiring no material components:

At will: disintegrate

Standing Leap. The Ancient Crystal Toad'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 Ancient Crystal Toad makes two bite attacks and one swallow attack.

Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) piercing damage and the target is grappled (escape DC 15). 

Swallow. The Ancient Crystal Toad makes one bite attack against a Medium or smaller target it is grappling. If the attack hits, the target must succeed on a DC 15 Strength saving throw or be swallowed. The grapple ends if the target is swallowed. The swallowed target is blinded and restrained, it has total cover against attacks and other effects outside the Ancient Crystal Toad, and it takes 9 (2d8) acid damage at the start of each of the Ancient Crystal Toad's turns. If the Ancient Crystal Toad takes 15 or more damage in a single turn from a creature it has swallowed, that creature is regurgitated and lands prone 5 feet from the Ancient Crystal Toad. The Ancient Crystal Toad can have only one target swallowed at a time. If the Ancient Crystal Toad dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 5 feet of movement, exiting prone.

Leap. If the Ancient Crystal Toad hasn't moved this turn, it can leap 60 feet in a straight line and make a bite attack against a creature or object within 5 feet of where it lands. This attack deals triple damage on a hit. The Ancient Crystal Toad cannot move on its turn after using this ability and cannot use this ability again until it ends its turn without moving.