There are 3 Thomas Pritchards in the Church Burial records.
As this is a double plot they could all be under these stones or maybe some where else in the Churchyard. I could make out the word Thomas but no dates. The Church has plot maps I do not have access to so would be the place to get more information.
Thomas 1798-1858
Thomas 1827- 1854
Thomas 1847- 1911