Argus is a watchful giant from Greek mythology. "Filch", of course, is slang for "steal".
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Hagrid is the Hogwarts caretaker responsible for various magical creatures in Harry Potter. Of course some of the professors have their own pets as well.
Argus Filch is the Hogwarts caretaker. He is a squib and therefore despises working around magical students at Hogwarts. He has a cat called Mrs Norris and is very easily annoyed. Filch has tried many times to get Peeves expelled and bring back the old punishments like hanging people upside down in the Dungeons for a day. He is portrayed in the films by David Bradley.
If you mean Mr. Filch, the creepy caretaker who has a cat named Mrs. Norris, then this is your answer: Argus Filch is played by David Bradley in the Harry Potter Films
In Hogsmeade there is a sweet shop called Honeydukes.
There is no janitor in Harry Potter at any time.