Terapanth Prabodh is a Śvetāmbara Terapanth composition by Acharya Tulsi, and the available descriptions show it as a Terapanth devotional/literary work. In the sources I could verify, I did not find any mention of Guru Nanak Dev by name. ( books.jvbharati.org)

So, if you are asking “where is Guru Nanak Dev’s name used in Terapanth Prabodh?”, I could not confirm any such usage from the Jain sources I found. If you have a page, line, or stanza from the book, I can help identify it precisely.