James M. Carpenter recorded three or four versions of "Jamboree" from old sailors in 1928. You can hear them singing through the scratches and static on the Folktrax CD.
"Oatcakes" and "hoecakes" are what they sing about in the choruses, though not all of Carpenter's British informants showed familiarity with the originally American word "Jamboree." (One man sang "Kangaroo, oh kangaroo!" though that version didn't make it to CD.)
And one old shantyman sings the final line as "Johnny let the bullgine run!" And why shouldn't he?