Heat the olive oil in a large saucepan over medium heat. Add the jalapeno, onion and a pinch of salt and cook until soft and translucent, 5 to 7 minutes. Add the garlic, cumin, oregano, crushed red pepper and black pepper and cook, stirring, for 1 minute. Stir in the sugar, chiles and stock and remove from the heat. Blend in a food processor or blender until smooth. Return it to the pan and simmer for 20 minutes. Taste and adjust the seasoning as desired.
For the filling: Spread the tots out on a sheet pan, then sprinkle with salt and pepper. Bake until crisp, 20 to 25 minutes. Remove from the oven and set aside, then reduce the oven to 375 degrees F.
Heat a large skillet over medium-high heat and cook the chorizo, breaking it up with a wooden spoon until fully cooked. Use a slotted spoon to transfer to a large bowl. Reserve a thin coating of fat in the skillet and discard any excess. Add the onion and a pinch of salt to the skillet and cook until softened, 5 to 7 minutes. Add the eggs and scramble, cooking until just set. (Err on the side of them being underdone, since they'll continue to cook in the oven.) Transfer to the bowl with the chorizo and fold to combine. Season to taste (you may decide not to add any salt, since the chorizo has salt).
Spread a thin layer of sauce on the bottom of a 9-by-13-inch glass baking dish. Arrange the tortillas on a work surface. Spoon a heaping 1/3 cup of the egg mixture onto each tortilla. Top with a handful of the cheese and 6 potato tots. Roll up the tortillas and arrange them seam-side down in the baking dish. Top evenly with the remaining sauce. Sprinkle the top with the remaining cheese. Bake until the cheese is browned, about 40 minutes.
Top with dollops of sour cream, jalapenos, radishes and fresh cilantro and serve.
When blending hot liquid, first let it cool for five minutes or so, then transfer it to a blender, filling only halfway. Put the lid on, leaving one corner open. Cover the lid with a kitchen towel to catch splatters, and pulse until smooth.