Stir together squash and 1/4 teaspoon of the salt in a large wire-mesh strainer set over a large bowl. Let stand until squash has released water, about 15 minutes.
Discard liquid. Place squash in a kitchen towel, and squeeze to remove excess water. Add squash to a large dry bowl.
Add flour, Parmesan, and eggs to the bowl. Stir.
Heat 1 tbsp of the oil in a large nonstick frying pan on med. heat. Take two tbsp of the squash mixture, flatten it. Place it in the pan. Repeat this process until you can't fit anymore patties. Cook until crispy and golden brown. Should take about 2-3 minutes.
Flip and brown the other side. Another 2-3 minutes.
Place on plate with paper towels to absorb the grease.
Repeat the process until all of your mixture is gone.
Sprinkle the remaining salt (if desired) on the fritters. Top with the sour cream and green onions (if desired). Serve.
Notes
ITEMS/INGREDIENTS USED IN RECIPE - If you are interested in any of the items I may have used (or are similar to the items I used) in making this recipe, I have listed all or some of them above within the post. NOTE: These links are affiliate links of which I receive a small commission from the sale of certain item. This does not affect your price, it remains the same.