Best nicknames to call front-end devs?

valet
Valet and varlet are terms for male servants who serve as personal attendants to their employer. In the Middle Ages and Ancien Régime, valet de chambre was a role for junior courtiers and specialists such as artists in a royal court, but the term "valet" by itself most often refers to a normal servant responsible for the clothes and personal belongings of an employer, and making minor arrangements.

Bad backend devs.

UI Monkeys?

Backend test subjects?

frontend developer

FE = ef E

"fronttipoika" = front boy

Maybe Pixelschieber? Its german and stands for pixel mover or something like that. We usually call our designers like that, not sure if it applies to front end aswell