Masa harina adds delicate corn flavor to these pancakes. Look for it on the baking aisle.
Place tomatoes in a food processor; pulse 2 or 3 times. Transfer to a medium bowl. Add cilantro, white onion, and green onion to food processor; pulse 3 times or until finely chopped. Transfer to bowl with tomatoes. Stir in lime juice and 1/8 teaspoon salt. Cover and refrigerate.
Lightly spoon masa harina and flour into dry measuring cups; level with a knife. Combine masa harina, flour, baking powder, queso fresco, and remaining 1/8 teaspoon salt in a medium bowl; stir with a whisk. Drizzle 1 tablespoon oil over top, and stir to form coarse meal with some pea-size pieces. Add 1 cup warm water, and stir until dough forms. Divide dough into 16 balls; flatten each to form into 2-inch pancakes.
Heat a large nonstick skillet over medium heat. Add 1 teaspoon oil. Place 8 pancakes in pan, and cook 2 to 3 minutes or until set and golden brown on bottom. Brush pancake tops lightly with about 1/2 teaspoon oil; flip and cook 2 to 3 additional minutes. Repeat procedure with remaining pancakes and oil. Top pancakes evenly with pico de gallo and crema.
It's kind of a lot of work but we loved these.