My OH is after a miniature Dutch hoe for small stuff.
The full size ones are anything between 12 and 15 cm but he needs one about half that size. We have looked all over the place, even children’s ones but they just have shorter handle and have the same size hoe.
He had one as a child and his dad used it by putting a normal handle on it when he grew out of it.
Apparently the small one is the right size to get between delicate plants as the normal size ones just plough through them no matter how you try not to.