North Western Chowder Fries

Name: North Western Chowder Fries
Ingredients: 2 tbsp unsalted butter; 1/2 large sweet onion finely chopped; 2 garlic cloves fresh garlic minced (grated); 2 tbsp all-purpose flour; 1-2 tbsp kosher salt; 1 tbsp Old Bay seasoning (optional); 3-4 medium Yukon gold potatoes (cubed); 1/2 cup heavy cream; 1 1/2 cup milk; 8 oz clam juice; 1 whole lemon (juiced); 3-4 sprigs fresh tarragon (chopped); 3-4 sprigs fresh thyme leaves; 1 can clams; 1 cup lump crab meat; 4-5 oz skinless salmon filet; 4-5 oz cod filet; frozen French fries for two