You can find the lyrics to all the songs from "Frozen" at Disney's web page, Frozen.disney.com. To find specific song lyrics, visit the web page, then scroll down to the "Frozen Song Lyrics" section and click on the desired song.
Each song in the "Frozen Song Lyrics" section contains an introduction, followed by the lyrics of the song exactly as they are performed in the movie and by which character or characters. The web page also provides a Karaoke link, where aspiring performers can record their voices over the movie's original soundtrack. Users can also find links to all "Frozen" song lyrics at Lyrics.wikia.com/wiki/Frozen_%282013%29.