There are at least five bands and one rapper with this name.
These are photos from concerts where Digger played, so they may be of other bands that played the concert as well.
Mustard Plug / Digger / Special Disaster Team Feb 21, 2000 Oklahoma City, Oklahoma, United States Uploaded by Skanzo
Good Riddance / Mustard Plug / Wretch Like Me / Digger / Riff Raff Feb 12, 2000 Denver, Colorado, United States Uploaded by Tomcat0011