If I counted correctly, there are 13 townlands across Ireland called Snugborough just not in Co. Kilkenny.
I saw a reference to Snugborough in the 1833 Tithe records for Kilmaganny civil parish in Co. Kilkenny . William Reade was the land holder. I was hoping to look at the 1850 Griffiths head of household listing for Kilmaganny parish and make a connection but William Reade had ten different properties in the parish in various townlands in the parish. So there is no way to make a connection.
You mention seeing official records with Snugborough, was that the Tithe listing?