It's been said, but some people use pollen as a word for kif, unpressed hash, although technically, in growing terms, pollen is what the male cannabis sacks are filled with. A yellowish powder than contains no THC at all.

Not a bad idea about the stems and stuff though, but I have tried something like this before. I grind up all the stems and shake, and on the sides of the coffee grinder lid would be all this dust. I just collected that and smoked it. It was horrible! If you do it this way, it is mostly stems dust grinded down to a powder, which is no different than just smoking stems.

You want to collect all that dust all the sides, then use a silk screen to sift thed kif through, but if you do that, there is no need to grind up the stems.

If you want just the kif from the stems, the kif is on the outer layer of them, not on the inside, so if you grind them, then sift it, you will get mostly stem dust again.

The best thing to do is to take your stems and shake, put it in the freezer for 30 minutes (that helps loosen the trichs from the plant matter) then shake the stems/shake through a silk screen method, and you'll be left with a much purer form of kif.

Anyways, it works though if you're that desperate, but save yourself the headache and don't smoke the stem dust.