Entitled "Fern Gully - Den Sista Regnskogen", Frida voiced the character of good fairy Magi Lune who is the first character you see and hear in the film, although her voice sounds slightly speeded up.
The film is about the destruction of the rain forest by man and this part is said to have appealed to Frida because of the environmental theme.
"Fern Gully - Den Sista Regnskogen" has been released on video in Sweden.
Information from ABBA Report, Issue 18 and The Internet Movie Database