No, satellites leave a very straight white trail across long exposure. That is most likely what is known as walking noise, which shows up in stacked images as a result of read noise and stuck pixels in the camera sensor.
Ah, well the stacking is not done by the camera. It’s a process that is done afterwards with many images, to average them and (ideally) improve signal to noise ratio.
I’m not sure I know the difference between an app and a program, but the one I use runs on a desk/laptop and is free. There are several others as well. Most dslr/dslm cameras still allow you to shoot in raw format, which is what is required for proper stacking
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