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.