I'll go the opposite way. I'm not saying NFL players aren't incredible athletes; they certainly are, and the strength and explosiveness of lineman is unbelievable. Not to mention their technique, which takes years to perfect.
But as pure athletic specimens, I'd take Crouser every day. Some posters here are seriously underestimating what it takes to put 20 meters, never mind 23. I don't think there's an athlete in the world who has his combination of strength, athleticism, and explosiveness. This doesn't mean that Crouser would be the best NFL lineman (although I DO think he could make the transition to a successful one). But in sprinting it's well recognized that NFL players may be fast, but real actual sprinters are quite a bit faster. I think the same is true for pure explosiveness: if you want the most explosive athlete, look at the most explosive sport/event, which is shotput far more than the NFL.
There's this weird inferiority complex in track where a lot of people feel that track athletes are the dregs of the athletic world, that somehow all the "real" athletes find themselves in other sports. This despite the fact that it is the #1 or #2 global participation sport, and that a huge number of talented athletes pour their heart and soul into it despite the often-meager rewards. Crouser is self-evidently one of those people, as is clear from his interviews and the way he treats the sport.
Also, note that there's no NFL-equivalent in most other countries. Rugby requires a lot more endurance and wouldn't be a good fit for the really big guys. So if the best potential shotputters all go to the NFL, why are Americans anywhere near the top in the event if they're competing with other countries' best?
Again, NFL players are incredible athletes, and no one else could do what they do. The overall level of competition in the sprints and throws in the US would hugely go up if they all switched sports, which is remarkable since they're predisposed towards a different sport. But when we're talking about someone the level of Crouser, then nah, there's no one who can do what he does.