Paul, the third one is my favourite, and you definitely got some of the cloud features there and a moon shadow.
As for how these things get their names, you'll have to search the net for that - I'm just using terms that I've seen around the place. These cloud features are all transient, so they get names like "festoons" and "barges".
I *think* the term barge refers to a large (usually blue) feature that slowly sails around the equatorial belt. In the image here you'd probably call the elongated blue cloud a festoon instead.
cheers, Bird
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