I wrote a puzzle book on the Scandi called "The Scandinavian Defense: Decisive Positions, Traps, and Blunders":
https://www.amazon.com/dp/B09NGRX44R/
It's a collection of 586 puzzles in all the major variations in the Scandinavian. It includes several chapters on 2... Nf6 lines (the Icelandic Gambit, the Scandinavian Gambit, the Portuguese Variation, and other lines in the Modern Varation).
Unlike typical opening books, the idea with this book for the reader to absorb the tactical themes that arise via hundreds of puzzles, rather than the usual approach of presenting a fixed repertoire to memorize.
Are there any resources out there for the Nf6 Scandi? 1.e4 d5 2. exd5 Nf6 as Black.