Fun fact for your trivia banks:
The difference between a gargoyle and a grotesque is easy to remember. A gargoyle is a decorated waterspout that projects from a roof and carries rainwater away from the walls of a building, protecting it from damage, whilst a grotesque is a decorative carving that has no functional architectural purpose.
Maybe, but on the other hand, if someone went to the effort to commission and have a grotesque installed in their property, they might just know. Still, probably not though.