In LEGO® Ninjago: Shadow of Ronin, it is up to players to help the Ninjas regain their memories. RELEASE DATE: 24 March 2015.
While I couldn't find a specific Lego Ninjago game developed exclusively for the PSP, there are several Lego games available for the console. These games often feature characters and themes from popular franchises, including Ninjago. Psp Game Lego Ninjago Download Torrent - Google