The name 'Frogpool' was attached to the village in the early years of the 19th Century and it described the natural feature for which the area was locally well known, a pond prolific in frogs. The pool existed some 100 metres to the west of the Chapel, where modern bungalows now exist.
As can be seen by a stroll around Frogpool, the old cottages and farmhouses indicate the size of the hamlet with the main feature being the Wesleyan Chapel and Sunday School, both having been built in 1843. The tradesmen and women of the village largely supported the mining and milling activities of the Cusgarne and Bissoe valleys which steadily declined into dereliction. Most of the buildings still remain however, having been converted into private dwellings.
The early history of the Cornish Arms can be traced in the West Briton of June 23rd 1848, which advertised the sale by private contract of 'all that desirable public house situated at Frogpool in the parish of Gwennap, known by the name of The Cornish Arms, held for the term of 99 years, determinable by the deaths of three lives aged 50, 21 and 20 years, subject to the annual conventionary rent of -/15s, also two dwelling houses, near to the above, with about three acres of good land held for a like term, with lives aged 40, 40 and 12 years, conventional rent -/18s. For further particulars apply to the proprietor Mr V Cornish, Frogpool near St Day.'
Another advertisement, in the Royal Cornwall Gazette of October 14th 1881 the Cornish Arms Inn was announced to let, with immediate possession, together with the three acres. Application was to be made to John Hare and Son, Brewers (at Treluswell) Penryn.