The boys, aged just 10 and 12, were brutally punished after failing to carry out the brutal task in the ISIS stronghold in western Mosul.
The boys were part of a group of children being trained by the terror cult to fight against advancing Iraqi soldiers, who have already recaptured vast swathes of ISIS territory.
Public amputations are a typical ISIS punishment technique although it is usually reserved for thieves.
The depraved cell recently released a shocking video showing prisoners being killed by children as young as nine.
The jihadis high school, thought to be in Raqqa, Syria, has children sleeping in dormitories.
Classes involve reading the Koran before studying.