but you can patent it.
I don't think you would be granted a design (let alone utility) patent that is as broad as "green and yellow blocks have significance, is a grid of 5x6, and has a keyboard below".
Not a lawyer though so what do I know
This one refers to Wordle in the spec (which implies it's well known) and cites 5 other patents. Not knowing how Wordle works, I wouldn't speculate as to their chances of getting a patent, but NYT seems to be pursuing a copyright approach for now.