Who knows this opening?

This opening:

1 e4 c6
2 d4 Na6!?
3 Nc3 Nc7
4 Bd3 d5
5

Are you familiar with it ??

I have seen similar fun-openings on the other wing.

1. e4 g6 2. d4 Nh6 3. Nc3 f6 4. Nf3 Nf7 for example.

Your black "opening" probably aims at a wall on light squares. If I would be playing something like this as black, I would try to continue with g6 // Bg4 and exchange it // Ne6 // f5(maybe)

But it certainly is too passive and probably bad if white just goes for f4-f5. ;)