Cornwall OPC Database is showing 2 children for Nathaniel and Ruth.
Baptism 5th October 1887, St Just in Penwith
Mary Jane Joll, daughter to Nathaniel and Ruth, carpenter of Pleasant Row
9th October 1889, St Just in Penwith
Ada Florence Joll, daughter to Nathaniel and Ruth, carpenter of Pleasant Row
The fact that these are NOT indexed under non-conformist, suggests they are Anglican baptisms?
A tree on Ancestry has Nathaniel's death in South Africa, 1900?
Maybe a Boer War death?
Indeed, FindMyPast has a Boer War record for an N Joll, in the Army Ordnance Corps.