There are at least five artists known as Grouch:
1) Bay Area Hip Hop legend The Grouch (often known as; and tagged as, Grouch.
2) NZ Electronic Producer, Grouch., Zenon Records Cosmic Conspiracy Records A-List Records).
3) DJ Grouch, from Toronto's world champion Turnstyles crew.
4) Late 90's Britrock band
5) Late 00's punk band from Asheville, North Carolina.
Biographies listed below:
1) The Grouch always wanted to make beats since he first heard about this music called hip-hop. Read more on Last.fm