I found this on Wiki. Hope it helps:
The tawse, sometimes formerly spelled taws (the plural of Scots taw, a thong of a whip) is an implement used for corporal punishment. It was used for educational discipline, primarily in Scotland, but also in schools in the English cities of Newcastle upon Tyne, Gateshead, Manchester and Walsall.This article then implies that if our characters spank with only
one of these it should be referred to as a
taw!I imagine that in modern-day usage
tawse has become an
identical singular and plural noun, much like fish, sheep, rice etc.
And if I'm wrong.... well...