Lol it's been all over Twitter over the past month, people trying to think of a nickname for Tatum. Many have tried "The Anomaly" and even some accounts like Statmuse have posted it in their recent JT posts. It's not the worst but it's a little weird IMO.
Others considered online are: "Shamrock Samurai", "Duke of Boston", "Green Reaper", "The Show", "St. Louis Sniper", "The Alchemist", "The Blueprint", "Green Goblin", "Green Lantern", "The Hulk" (if he adds even more muscle/mass), "Tatum Tornado", "Green Tornado", etc.
Personally JT is cool and simple, but I think "Shamrock Samurai", "Green Goblin" and "Green Reaper" are pretty cool. Maybe "The Blueprint" can sort of be a knockoff version of Tim Duncan ("The Big Fundamental")