To provide some more context and discussion to the lyrics/info Q just posted:

That "Dan Dan" is the Barouallie one I mentioned in the OP. I gave a link to a Barouallie Whalers rendition (audio) of it in that post, and here is another rendition from their performance at Mystic a few years back.
Live performance

The "issue" (as I see it!) is that although both Hugill/Harding's chanty and Abrahams/Barouallie Whalers' chanty invoke a "Dan Dan", they are different songs. This has left "us" without help in interpreting Hugill.

Hugill's "Dan Dan," as it appears in SfSS, is not in a great state. It's difficult to put together, from that, what the song might have really sounded like. Which may be why no one, really, *has* (that I have seen).

This "Jean Jean-o" from Grenada, however, does seem to be the same song (i.e. in variation) as Hugill/Harding's.