Yes. But.
Hear me out: it worked. The conflict lasted for YEARS, with minimal losses of life.
And Canada could provide cover for the whole thing by saying: "Oh, yeah, Denmark, man those guys are tough as nails".
That way, everyone is happy: Trump because he has stuff to post on Xitter, Greenland is left alone, and US generals get to talk down the situation after a while.
Win. Win. Win.