Agog is a great word.
Many years ago, I went to look for the Gog Magog Hills.... these are near Cambridge. I say look because at 75 m above sea level, they're not very prominent. In fact on a par with the lowest high point of any European state.
I was on the trail of lost hill figures claimed by the Cambridge academic and dowser Tom Lethbridge to be there, a bit like our lost hill figures at Foxhill.
I'm not convinced I found the hills and certainly no sign of hill figures therein. Still a great name though.... known locally as the Gogs.