What is "giggler"

Usage examples of "giggler".

He found nothing responsive to his intuate among the simpering gigglers and was about to leave.

Then she ushered me outside between the gigglers at the old-fashioned double desks and pointed toward the old covered bridge across the river, where it makes a sharp turn.

He thought how clean she was, her hands and fingernails, and how straightforward and unlike the gigglers in the schoolyard.

Some of them were other things, shamblers, gigglers, mutterers, throat growlers.