Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. Nc3/3...dxe4/4. Nxe4/4...f6

=Caro-Kann f6=

This has been tried quite a few times, but chances of success are low.

Epilogue
The f6 Caro-Kann is a rare line that weakens the kingside and hinders the development of the king's knight, but prepares an e5 push.