Yea if you look at lichess opening explorer you will see it's quite a successful opening for Black. There are three reasons:
1) A knight is worth about two pawns in crazyhouse so it is a sacrifice but it opens the f8 bishop with tempo, and Black gets faster development than White despite playing second.
2) The pawn can often be dropped on h3 defended by the c8 bishop and help launch a lethal attack on White's king.
3) When Black castles, the extra pawn on f6 gives added safety to Black's king. There are no attacks possible via e5 as for example in the French defence or if the knight had been moved.
1) A knight is worth about two pawns in crazyhouse so it is a sacrifice but it opens the f8 bishop with tempo, and Black gets faster development than White despite playing second.
2) The pawn can often be dropped on h3 defended by the c8 bishop and help launch a lethal attack on White's king.
3) When Black castles, the extra pawn on f6 gives added safety to Black's king. There are no attacks possible via e5 as for example in the French defence or if the knight had been moved.