Blind Accuracy.  The desmatosuchus does not suffer disadvantage on attack rolls with its tail for being unable to see the target. 

Bite.  Melee Weapon Attack: +6 to hit, reach 5 ft., one target in front of the desmatosuchus.  Hit: 7 (1d6+4) bludgeoning or slashing damage (desmatosuchus' choice). 
Tail.  Melee Weapon Attack: +6 to hit, reach 10 ft., one target behind the desmatosuchus.  Hit: 11 (2d6+4) bludgeoning damage.  If the target is a creature, it must succeed on a DC 14 Dexterity saving throw or be knocked prone.  If the target rolls a natural 1 on its saving throw, it also moves to the nearest space adjacent to one of the desmatosuchus' shoulders and takes 13 (3d8) piercing damage.