Any video editor apps

Not entirely FOSS, but the Google Play variant of Simple Gallery has a built-in image editor with some basic video tools. It's using a proprietary library so this version isn't on F-Droid.

Termux + ffmpeg

I believe this is the only one on fdroid:

Video Transcoder (Video transcoding between common formats) https://f-droid.org/packages/protect.videoeditor/

its not been updated in 4 years, and its clunky, but it does work. If you absolutely have to go opensource, this is ypur best option.

Otherwise, simple gallery (pro version) has a video editor, but its propriety, so only on the play store version, not fdroid

termux proot-distro , shotcut

I haven't seen any on f-droid. Not even to just to trim it.