I don't belive there is a group dedicated to those variations. But there are literally hundreds of Sicilian (all variations welcome) groups out there.
Bb5 Sicilian Group?
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Out of chess.com's generous 10-day free premium trial, I was able to make such a group!
http://www.chess.com/groups/home/bb5-sicilian
Are there any groups out there that play the Bb5 Sicilian? (Moscow/Canal/Rossolimo)
If so, I'd love to join, just couldn't find the groups through the search feature. If not, I'd be happy to join such a group if anyone ever forms one.