Squig Hoppers are crazy Moonclan Grots that ride upon bloated Cave squigs to battle. These Squigs have been fed a special brew of puffgut-balls and Hopsplatter fungus which boats them with gastric gases, giving them a surprising amount of lift but also makes them ill-tempered and ferocious due to the uncomfortable experience.
While many Grots have been devoured by their angry mounts, the luckiest or most deranged manage to hang on, however, giving the Moonclan scraps some remarkably effective cavalry. Squig Hoppers are held in awe by the majority of Moonclan Grots and gather around to hear their mostly fictitious tales. In truth they only cling on for their lives while trying to steer their erratically bouncing steeds into the foe, where the creatures' snapping jaws and ripping talons make short work of the enemy. 
Boingrot Bounderz are Squig Hoppers that survive their usual battle or two before being devoured by their mount, run through by an enemy or killed in an accident.
They are show-offs and wear moon-shaped helms, called Loon Helms, believing that no squig would dare eat the Bad Moon which seems to be true at times. Rest of the time these big armoured helmets protect the grot from blows to the head. Bounderz become better at clinging to their steeds that they can spare attention to fighting as well. They are armed with long pokin' lances, which when driven by the meteoric momentum of a hurtling squig can punch right through plate armour to skewer the victims inside. Boingrot Bounderz are excellent line-breakers and shock cavalry with the added bonus of being able to bounce clean over intervening obstacles to drive their charge home with vicious force.
- 1: Battletome: Gloomspite Gitz (2019) - The Squigs of War, pg. 30-31
- 2: Warcry section in Age of Sigmar website