The "Victoria, History of the Counties of England" states that various manors in Frodesley were held by Hunald, with the Frodesley family as tenants of Frodesley manor from 1277 - 1404.
It would seem the Handesacre family of Armitage Handesacre, (not far from Rugby) were the Frodesley family as such. The loss of tenure after 1404 resulting from the slaying of William? de Handesacre by his neighbour on his way to the Battle of Shrewsbury. As William's male heir died young, his estates were taken by the Crown and eventually divided amongst the descendants of his three daughters. (Handley Castle).
The Frogley family of Denchworth it would appear had no connection whatsoever with the Handesacre family. If anything they assumed the name of the village/manor of Frodesley, which has then been rounded down to Frogley. Although the family claim to be of Norman descent, it really is very doubtful. I'd say they were Saxon.