Place the chickpeas and black beans in a bowl and cover with water. Cover with plastic wrap and allow to rest overnight.
Strain and rinse the beans. Place in a food processor with the jalapeno, parsley, scallion, taco seasoning, and a pinch of salt and pepper.
Pulse until the pieces are very small and when you grab some in your hand you can form a ball out of it.
Pour into a bowl and mix evenly. Form puck shaped falafel with your hands.
Preheat 1/2 inch of oil in a frying pan. Gently place the falafel in the pan in batches. Fry the falafel flipping once to brown evenly. Remove onto a paper towel or rack to cool.
Mix the tzatziki ingredients and place in the fridge to rest.
Mix the tomato, cucumber, parsley, salt, and pepper in a bowl.
Fill the taco boats first with lettuce, then the tomato mixture, then the cheese, then falafel, then top with the tzatziki. Serve.