If Pincher laddies and Pincher kiddies are interchangeable than a Google search also found the following:

Pincher kiddies - men who worked for 'The Pincher Mac', whose name was MacNicholas, per Paul O'Brien of Dublin, Ireland, as published in the glossary errata of The Essential Ewan McColl Songbook, sixty years of songmaking by Peggy Seeger ©2001.

Cheers,

GEST Songs of Newfoundland and Labrador