Not exactly under 20s, but RA has announced an under 18s development squad:
Australian Under-18 Development Squad
Angus Grover (Waratahs/St Ignatius College)
Avery Thomson (Reds/GPS)
Bailey Bouquaiux (Brumbies/Royals)
Bennett Armistead (Reds/Nudgee College)
Charlie Poynton (Waratahs/Barker College)
Dylan Bretton (Brumbies/Wests)
Edwin Langi (Waratahs/Eastern Suburbs NSW)
Ewald Kruger (Reds/GPS)
Finn Mackay (Reds/St Laurences College)
Frankie Goldsbrough (Reds/Easts QLD)
Hayden Lavercombe (Waratahs/The Kings School)
Isaac Fonua (Waratahs/The Kings School)
Jay McKenzie (Waratahs/The Scots College)
Jonty Fowler (Waratahs/St Josephs College)
Josh Takai (Reds/Brothers)
Kingsley Uys (Reds/The Southport School)
Leo Jacques (Waratahs/The Scots School)
Luca Cleverley (Waratahs/Newington College)
Marshall Le Maitre (Waratahs/The Shore School)
Nick Hill (Waratahs/Barker College)
Sam Blank (Waratahs/St Augustine's College)
Sam Niulala (Waratahs/Eastwood)
Talia'uli Latukefu (Brumbies/Marist College)
Toby Brial (Waratahs/The Scots College)
Tom Hartman (Waratahs//St Ignatius College)
Tom Robinson (Reds/UQ Rugby)
Treyvon Pritchard (Reds/Anglican Church Grammar School)
Will Ross (Reds/Padua College)
Unavailable due to injury
Manaia Tetana (Force/Wanneroo)
Rugby Australia has announced the Australia U18 development squad for 2024.
www.rugby.com.au