For the dip, combine all the ingredients in a small bowl. Cover and refrigerate until ready to serve.
For the cakes, place zucchini, carrot, and onion in a colander. Allow to drain for at least 2 hours. Blot any excess moisture with a paper towel.
Heat oil to 375 degrees in a large skillet.
In a large bowl, combine breadcrumbs, seasoned salt, and garlic powder. Stir in eggs and butter. Add shredded vegetables and mix until everything is well-combined.
Place flour in a shallow bowl. Shape zucchini mixture into small patties. Dredge in the flour, coating both sides, then place in hot oil. Fry for 7-10 minutes, flipping halfway through. Drain on paper towels. Serve hot with dill dipping sauce.