Cave Troll

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

Regeneration. The troll regains 10 hit points at the start of its turn. If the troll takes acid or fire damage, this trait doesn't function at the start of the troll's next turn. The troll dies only if it starts its turn with 0 hit points and doesn't regenerate.

Sunlight Sensitivity. Disadvantage on Wisdom (Perception) checks when in light from the sun or from the daylight spell. 

Multiattack. The troll makes two or three attacks: one with its bite and two with its claws; one tongue, one bite, one claw; one rush, two other.  Or, two ranged attacks. 

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) piercing damage.

Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) slashing damage.

Stomp. Melee Weapon Attack: Reach 5 ft., multiple targets. Hit: 11 (2d6 + 4) bludgeoning damage. Affects all medium or smaller creatures within 5 ft. of the troll, they must make a DC 15 DEX or be knocked prone. If creature saves, takes half damage and isn't knocked prone. If you're prone already you have disadvantage on the save. 

Rush.  Move 10 ft. in straight line towards target, to try and knock them prone.  DC 15 STR/DEX. Often followed by two stomp attacks. 

Rock Throw. Ranged Weapon Attack: +7 to hit, reach 30/60 ft., one target. Hit: 21 (3d10 + 4) bludgeoning damage.