Using single frames in FCPX

With the clip on the timeline, position the playhead on the frame you wish to freeze and type Option + F or go to the menu Edit > Add Freeze Frame.

Once the frame is created you can trim and adjust it as needed.

MtD

yes you can, use "retime" after inserting clip into the time line,, with the clip selected and the playhead parked on the frame you want, click on the small clock under the viewer.

then choose "hold"

then, right click the "retime editor" above the clip, and choose "customize"

Then change the "duration" to what you require.

now you can trim the excess clips which are outside the "hold " (red strip on the retime editor). note: you can only change extend the duration of the hold using the "customise" step.

hope this helps.

There are two ways to do this: freeze frames vs hold frames. For a good 60-second tutorial comparing the two, in Youtube, query on "Ep 87 Freeze & Hold Frames." Ripple Training covers that.

99% of the time I use hold frames.

Yup, recommend hold frames, less likely to introduce banding or compression issues, if you get any banding with hold, add mild grain, enable dithering on export.