Yeah, the use of the word "younglings" was a strange choice there. It dehumanizes the tragedy (and the power) of the moment in a way that saying "you killed the children" would have brought.
But, they weren't children. They were brainwashed indoctrinated magical super-soldiers, each one capable of single-handedly slaughtering entire battalions of mortal men.
It's important to remember that without Anakin there to counter their force powers, the younglings would have effortlessly annihilated those clones.
They would? So how were the Jedi wiped out? Because of what I remember most of them went out like punks.