spandogs

from The Century Dictionary.

• singular In the bending of barrel-staves, a bar of iron used as a holder to retain the curved shape of the staves until they have cooled, when they will not bend back.
• A pair of iron bars linked together at one end and having sharp hooks at the other, used for grappling timber. See cut under dag.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural A pair of grappling dogs for hoisting logs and timber.