Tonga's squad includes Cronulla Sharks player Addin Fonua-Blake and New Zealand Warriors teammates Dallin Watene-Zelezniak and Demitric Vaimauga.
Also named are Haumole Olakau'atu of the Manly Sea Eagles, Isaiya Katoa of the Dolphins and Jason Taumalolo of the North Queensland Cowboys.
With the NRL season finished, attention has shifted to the Rugby League World Cup, as nations confirm their tournament squads.
Kevin Walters announced Australia's 23-player squad on Monday.
England has made a surprise selection, while Tonga has confirmed a strong squad.