Lazard Gambit/Budapest Trap. It's unsound, but works against lower-rated players.
Blackburn shilling gambit
Dutch Mate
The Blackburne Shilling Gambit can be played against the Italian. This works great against below 1000 folks and almost everyone falls for this.
Yeah but 4.0-0 or 4.N×d4 are very good for white.
Here : 1.d4 f5 2.Bg5 h6 3.Bh4 g5 4.Qh5#