It's Clyde.
I've seen a little speculation elsewhere about who Mintberry Crunch is, but no one (in this limited sample) suggested a major character, except for a few suggesting Kenny (obviously before this episode aired).
You’re right, Clyde not Craig for Mosquito. Craig wasn’t in the group.
Other internet resources suggest that Mintberry Crunch is bradley, who apparently has appeared on other shows. I don’t remember him.