It's not like any marlinspike I've ever seen and though it may be a type of crows foot I haven't seen any like this either but if Kim says that's what the mechs call it that's good enough for me, although the pics of those I've seen are very different, there's no forked claw. It's about 18" long. I have found it pretty useful at times when needing to apply brute force to a small area and I've been grateful to have it but it mostly goes unused.

I thought it might be something used by steel workers or maybe loggers for setting chokers or something like that. Since I found it up here in Oregon loggers makes sense. I sharpened the tip since this picture so I can use it to punch holes in a burn barrel, if that works out. Might be easier to drill the holes though.