"Boy, you better stop watching so many cartoons!" he said as the dispatcher laughed.
But instead of blowing off the call as a prank, police showed up to TyLon's house to let him know that his Christmas won't be stolen.
"I can NOT make this up!!! My 5 year old brother called the police and said that the Grinch is stealing people Christmas and he don't want him to steal his so they really came to our house!" TeDera Dwayne Graves II wrote in a post on Facebook.
"I asked [TyLon] if he saw the Grinch, what would he do, and he said he'd call us and get us to come take him to jail. So I ended up looking around and I found him," Byram Police Officer Lauren Develle told the Clarion Ledger.
On Monday, police arrested the Grinch and brought TyLon to the station to confront identify him.
"You have saved Christmas for the people of Byram," the Grinch told TyLon. "Your bravery is unmatched. You have saved the day."