Probably not, unless you're describing Nail Pond, the town and body of water on Prince Edward Island. It is more likely you're talking about implements used in construction. That would be a "pound of nails."
It means to be exact or make a valid point. It is related to "hitting the nail on the head." A good carpenter would be able to swing a hammer and center it over the head of the nail as they hit it. That way, they don't bend the nail nor smash their finger. So just like a good carpenter swings with accuracy, the phrase can be used to mean being exactly correct.
'Tooth and nail' is the complete phrase.
to be a big fish in a little pond
'In the hope that' is the correct phrase.
If you are referring to this sentence, no, it does not resemble a correct phrase AT ALL.
into a piece of wood
If you hit a nail with a hammer.
This is not a sentence it is a phrase and as a phrase it is correct.
Try googling the phrase "nail printer". It should get you what you are looking for.
That is the correct spelling of "phrase" (word group, or to use specific words).
The correct phrase is "Did they?".
The correct phrase is "sufficient proof".