10:05 AM PT -- 10/15 -- Garrett says there's no real significance to his quarterback cemetery ... explaining to reporters Friday he decorated his yard with the tombstones because "I'm kind of a troll."
Garrett added his friends and family loved the idea as well ... saying, "People in my house love to have fun."
It's officially spooky season at Myles Garrett's house ... 'cause the Cleveland Browns superstar has decorated his home for Halloween -- with gravestones of NFL QBs!!!
The 25-year-old put out the set up at his Ohio pad just a few days ago ... laying headstones on his front lawn with seven quarterbacks' last names, numbers and helmets on them.