King's Gambit Variation (C32 King's Gambit Declined, Falkbeer, 5.de) 1. e4 e5 2. f4 d5 3. exd5 ...

Instead I made the move 3. fxe5

What can this variation can be named as?

 [Fen ""]
 [Event "Let's Play!"]
 [Site " Chess.com"]
 [Date "Jul 1, 2016"]
 [White "anandsadasivam"]
 [Black "MaximusXIV"]
 [Result "1-0"]
 [WhiteElo "1168"]
 [BlackElo "1000"]
 [TimeControl "1 in 14 days"]
 [Termination "anandsadasivam won on time"]
 1. e4 e5 2. f4 d5 3. fxe5  1-0


Wherein the one with ECO code C32 comes up like this

[Fen ""]
1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. dxe4
1. e4 e5 2. f4 d5 is known as the Falkbeer Countergambit.

However, 3.fxe5?? is not a variation but a blunder. As Wikipedia explains, you will either lose material after  3...Qh4+, 4.g3 Qxe4+ (due to a fork between the King and the Rook), or expose your King to the black pieces after 3...Qh4+,  4.Ke2 Qxe4+ 5.Kf2 Bc5+.

I am not aware of a name for 1. e4 e5 2. f4 d5 3. exd5 e4 4. d3 Nf6 5. dxe4. Not every opening variation has a name.