And I'll add it too the GL Wiki. If you have links that would be helpful too. Alternatively you can email me.
Ones I know:
M-Kids from Belgium, they are adolescents now
Kinderen Voor Kinderen from the Netherlands have girls and boys
Priscilla is a French singer
Smoosh, the one I think you are referring to
The girls from American Juniors but I'm not sure if they have careers in music now.