Agree, not for tatting.
If you think your Grandmother may have made leather gloves, to me that would be a good guess!
I can see that each of them could be good pushers for turning the fingers out and making the seams smooth against the fingers.
Just an educated guess .... and thinking they resemble the type of tools we would use when turning a piece of fabric and pushing out the corners.
Now I'm curious as to how close to the guess, I am!