In DR context it's pretty much exclusively used to refer to attackable/huntable NPCs. "Critters" is/was just a cutsey term to indicate the same thing, whereas mob is a recognized term within the genre/industry.
"But you must know that if corruption is powerful enough, it's not corruption at all — it's law. Unspoken, unwritten, but law." — Robert Jackson Bennett, CityofStairs
10-4. Thanks. Curiosity was driving me nuts and I can admit that I was too lazy to look it up. Recipe for a perpetual cycle of diabolical self inflicted suffering.