The 'piggy back songs' (these are new words to a familiar tune) do typically have the words in the Teacher Guide. For songs that are on the Songs From FaithWeaver CD (a compilation of many of the songs from the various FaithWeaver age levels) does include electronic text files on it, and you could use those. In addition, the older elementary levels have Lyrics Posters in the Teacher Packs.
I hope this helps. Please let me know if I can be of service in any other way. God bless you and your ministry!