In the Caro-Kann where white plays 3.Nd2, it seems like the d2 knight is misplaced: it's on a worse square than c3, and it blocks the c1 bishop. Black playing 3...dxe4 relieves white of both these problems (along with allowing white to play Bc4). However, 3...dxe4 is by far the most popular move, probably partly because black has probably "booked up" on this line.
[FEN ""] 1.e4 c6 2.d4 d5 3.Nd2
Question: Is it worthwhile delaying or avoiding 3...dxe4 to exploit the poor position on the d2 knight?
Judging from LiChess's master games, some players have tried 3...g6 followed by 4...Bg7. For example, some master games follow the following lines (e.g. Smirin vs. Bologan, 1994, 1/2-1/2):
[FEN ""] 1. e4 c6 2. d4 d5 3. Nd2 g6 4. Ngf3 Bg7 5. c3 Nd7 6. Bd3 dxe4 7. Nxe4 Ngf6 8. Nxf6+ Nxf6 9. O-O O-O