While working on Guardians of the Galaxy Vol. 2, writer/director James Gunn spends a lot of time mining the Marvel back catalog for material such as: which obscure alien species should he include as background characters?
Apparently, not Sneepers.
"Every name I use I have to run through the Marvel legal department," he wrote. "...It's always a bummer when I can't use a name, usually because Fox or Sony or Hasbro or whomever owns the rights. But today I received a brand new reason for being advised against calling one of the alien species 'Sneepers.'"
He revealed the reason is that "Sneeper is a word for clitoris in Icelandic."
I looked it up, and it's true: Sneeper, sneepur, or snipur is an Icelandic word for clitoris. Thanks, James Gunn, for broadening our linguistic horizons!