I think I have finally solved the mystery of the delicious churros we've found in the eastern side of Guadalajara. They're usually filled and rolled in canela which is way too sweet for me, but they're perfect when they're hot and rolled in canela. I know they're name, where they come from, and how to make them.
Video from an Atotonilco stand with really different churros
Video from Ocotlan, which is on the north side of Chapala near the Michoacan border
As usual, the information I needed was online but I didn't know what to search for. But once we'd asked enough questions in enough different places, I got what I needed.