Hello

I work in a library and we have had an inquiry on the following song:

As I went rolling, strolling, rolling
Over the rolling sea
I put three shots
In their lobster pots
So they won't frighten me

I ... put three shots
In their lobster pots
So they won't frighten me.

Our inquirer is after any information on the origins, history, meaning of the song.
he thinks it is either Scottish or Canadian

Thanks for any clues anyone is able to give!
Regards
Jane Miller