Multiattack.The lizard makes two attacks: one with its bite and one with its tail. One attack can be replaced by Swallow.
Bite.mw 7 to hit, reach 5 ft., one target. ({@damage 2d10 + 5) piercing damage and the target is grappled (escape 15). Until this grapple ends, the target is restrained, and the lizard can't bite another target.
Tail.mw 7 to hit, reach 10 ft., one target not grappled by the lizard. ({@damage 2d6 + 5) bludgeoning damage. If the target is a creature, it must succeed on a 15 Strength saving throw or be knocked prone.
Swallow.mw 7 to hit, reach 5 ft., one Medium or smaller creature the lizard is grappling. ({@damage 2d10 + 5) piercing damage. The target is swallowed, and the grapple ends. The swallowed target is blinded and restrained, it has Cover||3||total cover against attacks and other effects outside the lizard, and it takes 10 (3d6) acid damage at the start of each of the lizard's turns. The lizard can have only one target swallowed at a time. If the lizard dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 10 feet of movement, exiting prone.