Can I substitute whole anchovies for anchovy paste? I have several recipes that call for anchovy paste; I think they're typically vinaigrettes.  They don't carry the paste at Trader Joe's so I bought a small can of whole anchovies.  

Can I substitute the whole (presumably chopped/smashed/pureed) for paste?  I assume I would use the same volume?  And for others, can paste be substituted for whole in recipes where the whole anchovy is going to be pureed anyhow?

Oh, and since I'll have leftover anchovies from the can, I assume they will freeze fine for further anchovy paste substitutions?
You can easily make your own anchovy paste from canned anchovies.   This America's Test Kitchen video shows how:


Chop the anchovies fairly finely
Mash with a fork until smooth


Some sites recommend adding  a little oil for a smoother texture.

I have never tried it, but I don't see any reason this would not freeze exceptionally well, as neither whole anchovies nor the paste are used for their texture.