For kids sports games, I am recording using a camcorder. Separately I am using a cell phone to take picture of the scoreboard whenever the score changes.

In the finished video, I wanted to merge the still image of the scoreboard into the main clip, at the time when the scoreboard photos are taken.

When I import the main clip and the still images, can Kdenlive align them based on the file timestamp?

So say video clip starts at 3:00pm and ends at 3:30pm, and I take a picture of the scoreboard every five minutes. Can Kdenlive align the images based on the picture timestamp and align them with the timeline of the video clip?

Thanks in advance.

No this is not possible. You can set manually guides to know where to add the picture on a separate track. Hit G to set a guide in the timeline. You can jump with alt+arrow to the guide.