What Psalms are sung on Thanksgiving Day? What Bible passages are read in the church on Thanksgiving day?
You will find “lectionaries” on pages 163-166 in Christian Worship: A Lutheran Hymnal. Those lectionaries contain Scripture readings, including Psalms, for worship services.
Pastors might use those Scripture readings for Thanksgiving Day worship services, or they might use other sections of Scripture. We enjoy this kind of Christian freedom in planning and carrying out our worship services.