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Place zucchini in a colander. Sprinkle with salt and let stand 30 minutes to drain. Squeeze zucchini between hands to remove excess liquid then squeeze dry in several layers of paper towel.
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Combine zucchini, green onions, eggs, flour, herbs, salt and pepper in a large bowl. Mix well.
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Fold in feta cheese.
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Fold walnuts into zucchini mixture.
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Preheat oven to 300°F. Place rimmed baking sheets in oven.
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Pour enough olive oil into a large skillet to coat bottom. Heat oil over medium-high heat.
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Working in batches, drop zucchini mixture into skillet by heaping tablespoons; flatten slightly.
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Fry until pancakes are golden brown and cooked through, about 3 minutes per side.
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Transfer each batch to baking sheet in oven to keep warm.
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Serve pancakes hot!