It’s pretty easy to jam as it’s just radio waves. Increase the noise on the channel and the chirps of your msg don’t get heard. That said there are some options to vary the channel as a group, and jamming a broad and robust mesh completely vs an area of nodes is a bit harder.

Trackable as in traceable? You mean finding your node location? By default not overly difficult but again, can be set up to make it hard to find you.