https://goo.gl/photos/4sYsTFsofBNfawjh9
At the top of this album, I photographed some book entries on Beetles from
four of my reference books (some books didn't have an entry for it at all
under this spelling).
Basically a maul, typically with iron rings.
What they term a Beetle isn't what we typically use with a froe though- it
seems as though the term originally meant a big ol mallet for bashing stuff
into place or into the ground.
Cheers from Waterloo
Claudio