Frognall is the name of a small village in Lincolnshire, England, as well as Thomas Frognall Dibdin (1776- 1847) an English bibliographer and founder of the first book club, the Roxburghe. Frognal is an area of northwest London. No word on whether the name - with one or two Ls - belongs to a saint or not.
There are a number of people venerated as saints within the Christian Church who are named only as Companions of another named saint. When martyrs met their fate with a band of anonymous or less well-known supporters, these “humble spear-carriers for the Lord” are often memorialized in the phrase “and companions.