There is a de-clicker and popper plugin.
https://forum.audacityteam.org/t/updated-de-clicker-and-new-de-esser-for-speech/34283/1
But that can damage the sound, too. You should really find out why your computer is doing that.
Stop all other jobs and processes. If you have USB connections, pull and reseat both ends firmly with the computer off.
Is it still like that if you just restart the computer from power off? Does it get worse the longer you speak? Can you do anything to make it better or worse?
Koz