http://wiki.audacityteam.org/wiki/Nyquist_Effect_Plug-ins#Noise_Gate
Sorry. I can’t always tell which ones are which.
Also see:
https://forum.audacityteam.org/t/automatic-removal-of-mouth-smacks-again/31897/1
Post a sample of the work. Use good quality MP3 (128 on a mono track).
https://forum.audacityteam.org/t/how-to-post-an-audio-sample/29851/1
Koz