Unless your buying vhs or dvd I doubt there a lot of 2005 and before AV for download and even there is probably very low quality. Ryoko Mitake was popular back then I think, but retire already.
Cute & little chubby?
Sora Aoi
Azumi Kawashima
Yua Aida (not chubby at all)
Anna Ohura, has huge natural boobs too
Hanano Nono, not famous but in the your criteria (cute & little chubby)
Megumi Haruka
Nana Konishi
:study: