Help for frame capture in Premiere Pro
A recent search terms report shows that a number of users searched for "capture frame," or "frame capture," when they wanted to find the topic about grabbing a still from video. Reasonably, these users thought of frame capturing as a kind of capture or import. However, the Help topic for it lives at the other end of the Help system, not under "capturing," but under "exporting." In any case this is the topic for which those users searched:
Export a still image