Though the shape of the blade is not an exact match to the original subject of this thread it is close enough to show what it was possibly originally intended to be used for.

This was listed as an "18TH CENTURY LG SIZE PRIMITIVE GARDEN DIBBLE W HAND FORGED BLADE & WOOD HANDLE". Like quite a few items I have saved over the years I wish I could locate the one that belonged to my Great Grandmother to post as another example. Unfortunately like too many other items I have owned, after moving from one place to another it has been misplaced hopefully to be found sometime in the future.
Best,
Robert