2 knight checkmate-is it possible

hello,  just wondering if it is possible to mate opponent with just two knights..what is the final setup look like

With a pawn, yes.

Without a pawn, then only if its a helpmate.

It won’t be a forced mate.   Your opponent has to move the king to the corner voluntarily, then you can checkmate with the knights and king.  

King would’ve escaped with f8,  but made an ill fated h8 Move. Checkmate! 

yes, it's possible, just not with from best play from the defending side.

Checkmate by  N+N vs. nothing   is possible, but  the mating square must be one of the 28 edge squares and mate must come immediately after a blunder by the matee.

In other words, mate can't be forced.

No, the king doesn't have to be in the corner:

nice, thanks!  didn't consider that possibility.  White king is the corner in this scenario. 

2 knight checkmate is possible in the right conditions and quite difficult.  The hardest checkmate I have had to play was King, knight, and bishop vs king and I barely succeeded.

nobody asked about knight and bishop.

As others have said, KNN vs. K is a draw, barring a blunder into mate in one by the side with the king, but KNN vs. KP can be a win, depending on the position of the pawn and whether it can be blockaded.  (It can even be a forced win that takes longer than 50 moves with best play.)

I once saw a KNN vs. KP endgame in person at a tournament -- I think it was two players around 1800 or so.  Tragically, after the side with two knights had played well, it ended something like this: