I'm with 2 sheds on this one.
When I was in TC most ATCOs just joked 'prawns' to each other and then got on with the serious business of a proper, common-sense handover which didn't require yet another acronym. I still don't see 'PRAWNS' in MATS Part 1 so it couldn't have caught on with ATSD. Presumably it remains a nats-only so-called 'best practice'.....