So , i just discovered that in France, there's FOUR words for it, depending of where you live --- Post updated --- In most part if France, it's "Pain au chocolat"(Chocolate bread) In South western France, it's"Chocolatine" In a little part of the North and a little part of the East , it's "Petit pain" little bread And in another part of eastern France, it's "Croissant au chocolat" ( Chocolate croissant)
I live in the eastern France and I never heard this, whatever the region (perhaps a very remote one).