Stench: Any creature other than an ankheg that starts its turn within 5 feet of the young ankheg must succeed on a DC 11 Con save or be poisoned until its next turn. On a successful save, the creature is immune to the stench of all ankhegs for 1 hour.
Bite: +3 hit, 1d4+1 piercing and 1d4 acid. If the target is Small or smaller, it is grappled (escape DC 11). Until the grapple ends, the ankheg can only bite the grappled creature and has advantage on attacks to do so.
Acid Spray: line 5 feet wide and 15 feet long. Creatures must succeed a DC 11 Dex save, taking 2d6 acid damage on a failed save or half as much on a success. Recharge 6.