What you have there are arrow shaped brushes. Make your new transparent layer. Use the brush tool and as a 'Stamp' one click only. (As on the GimpHelp download page)
Typically lots of variations for old versions of Gimp but now, the brush tool options will size, rotate, change proportions. Many of those are now redundant. Some will be always be black-and-white, others (known as greyscale brushes) use the foreground color. Just experiment with what you have.
A better way is using an arrow script see:
https://www.gimp-forum.net/Thread-Arrow-...7#pid24907 and the download link. Unzip the download, read the PDF on use, put the arrow.scm in your Gimp user profile ~/.config/GIMP/2.10/scripts/
This uses a path for the body of the arrow, find the script entry in
Tools -> Arrow -> Arrow lots better than the brush arrows.
If you can see it, a 60 second animation demo:
https://i.imgur.com/WqA7BrX.mp4