"Rolla" is a half-way derogatory word for a female sheep. It implies age, stupidity, stubbornness and bad temper. It's also a nick-name for a Toyota Corolla (although a different pronunciation is used), but since this is on a Nissan, it must be the other meaning.
"Heilsa" means "health". I'm guessing the owner is a health-care worker or a health nut.
This needs no explanation.
Nor does this.
This one muse be seriously depressed.
"Veiðir" can mean "hunts", "fishes" or "seduces" (colloquial meaning).
"Rokk" = "rock" (both meanings).
Another one that needs no explanation.
A Pippi Longstocking fan?