Squeeze excess moisture from zucchini. Drain on paper towel. Combine zucchini, potato, bacon, flour, egg and chives in a bowl. Season with salt and pepper.
Heat oil in a large frying pan over medium-high heat. Spoon 1/4 cup zucchini mixture into pan, pressing to flatten. Repeat to make 3 more fritters. Cook for 5 minutes or until golden underneath. Turn, pressing again to flatten. Cook for 5 minutes or until golden and crisp. Transfer to a plate lined with paper towel. Cover loosely with foil to keep warm. Repeat process with remaining mixture.
Meanwhile, make Garlic yoghurt: Combine garlic and yoghurt in a bowl. Season with salt and pepper. Sprinkle fritters with extra chives. Serve with garlic yoghurt.