I don’t know if any. You could look around a bit and find some open sourced stuff. If you have a large NAB your going to want to be careful it does not delete entries that are close to each other.
You could create a view showing all Person documents.
Show the Persons First Name + Last Name in the 2nd column
Categorize the column + show twisties.
Then in Col 1 set the Col formula to be @Count(FirstName)
Set it to total.
Any Cols that show 2 as the total are your duplicate entries.