A walking billboard

[plátano frito]

How would you say the term "a walking billboard" in spanish?

I need this for an essay I'm trying to write and I can't find it in the dicationary except a billboard is un anuncio espectacular. Thanks. :)

[Little]

I don't know if this is right or not, it's kind of a guess- "anunico ambulante".

[sosia]

It's "hombre anuncio"

[plátano frito]

It's "hombre anuncio"
Thanks man, I appreciate it. :)