Terrier - it's not in Classic English Folk Songs; "Rounding the Horn" ("The gallant frigate Amphitrite...") is in CEFS, but that's a different song.

Steve - which thread? The Dolphin as I know it - James Sutton's Dolphin, I suppose we should say - isn't in the DT or, as far as I can see, anywhere else. (Although I haven't got Boxing the Compass, which would be the obvious place to look.)