Sandals is a very geographic nomenclature, in Portuguese sandals or “sandalias” for anything that’s not an enclosed shoe and hold on via straps, like what Michelle wears down to flip flops. A single wide band accross the center of the foot and suddenly it’s a slipper, or a “chinelo”, same name as a bedroom slipper.
Crocs are crocs, or “socos” (pronounced sock-oos)if you’re oldscool as that’s what we call those old dutch wooden soled clunkers that inspired crocs.