What is the name for this tactic?

Here is the tactic, is there a name for this, I see this patter on the trainer all the time.

https://www.chess.com/puzzles/problem/1008094

A fork?

Exchange sacrifice, a pony for a rook (I guess)

Theme: Knight Outpost
 
Theme: Vulnerable King
 
Theme: Sacrifice
 
Theme: Mating Net
 
Theme: Pin
 
Theme: Simplification

This is a pin. Usually when you think of pins the pin is already there. Think of the bishop that is pinning a knight to the king in the opening. Here there is no pin yet. You'll have to set the pin up. To do that, you'll need to play moves with tempo, like checks. At first in this tactic there doesn't seem to be a way to use the pin on the h-pawn yet after Qh4+. It only appears when white plays g3, because all other moves lead to checkmate. Only in that position the pin is apparent: Qh4 pins the h2-pawn to the rook. And as pinned pieces are bad defenders, you'll win the g3 pawn. In the subsequent position white has no way to actually save the rook, as not taking the knight gives black the possibility to use a different tactic: a discovery attack.

Of course these puzzles try and teach you something different that's very important and that is how weak the white king becomes when the h4-e1 diagonal (or h5-e8 diagonal for white) has become opened. With a white pawn on f2 there would have been no danger at all.