Did you read the requirements to be a Frontier FA?

Applicants should be at least 20 years old, have no tattoos from their shoulders to fingertips, neck or chest area and behind the ear. Women cannot have tattoos from their mid thigh to their toes and no multiple piercings. They also should bring valid passports and a current resumes.

It looks like as long as you don't have a Tattoo you're in!!