Snotlings are are smaller Grots that run around in small mobs (all on one base). What they lack in size they make up for with noise.
Grots are not short of small, cheap disruptive units. Snotlings are another unit that can take on this role.
Snotlings have a 6″ ranged attack, and a close combat attacks. The ranged attack in only short so you may only get one shot before assaulting, or being assaulted. However if you sit your Snotlings on the sidelines as you Orruks take on the enemy and have the Snotlings fire in to the combat.
Don’t get excited about the amount of damage the Snotlings will cause. The basic chance to wound is 5+,6+, or 1 in 18 (5.55%). Even if you are 6″ then the melee attacks only come down to 1 in 12 (8.33%) per attack. So with 5 melee attacks per base you get a 27.5% or 41.65% chance of wounding per base depending if there are any Orruks around. If you do wound there is no rend and 1 damage per unsaved wound!
In summary Snotlings are not going to be game winners. You may want to add them to the army for fun but that is about it!