croc · noun1
Clipping of crocodile.
croc · noun2
From the American shoe company Crocs, Inc., reportedly named for the shoe's resemblance in profile to a crocodile snout or the "multi-environment, amphibious nature" of the animal.
Croc · noun3
From the name of the American shoe company Crocs, Inc.
Etymology from Wiktionary, CC BY-SA 4.0.