After the death of their teammate, Pyrrha Nikos in "End of the Beginning", the three remaining members briefly formed Team RNJR with Ruby Rose after her own team was fractured. After Ruby's old team was reformed, Jaune, Nora, and Ren collectively went as Team JNR.
Flower Power (Nora + Ren) - The specifics are not known, but it is named as such because, as Jaune describes it, "Ren brings the flower, Nora brings the power." The full version of the team attack is revealed in RWBY: Amity Arena, where Ren stuns multiple enemies, then Nora launches him and delivers a powerful attack on them. This attack may have been briefly seen in "The Enemy of Trust"
Arkos (Jaune + Pyrrha) - Described as "that thing, when we take our shields...?" by Jaune. The name is a portmanteau of the pair's last names, Arc and Nikos. The full version of the attack is revealed in the Chinese mobile game, in which Jaune and Pyrrha ride their shields and land on an enemy from opposite directions before performing an X-shaped slash with both their weapons.
Pomegrenade (Pyrrha + Nora) - The team attack was first revealed in RWBY: Amity Arena and is purely an in-game team attack. As its card info states, Jaune thought up of this team attack during the last second in order for them to fend off the Death Stalker that Jaune and Pyrrha come across in "Players and Pieces", wherein Pyrrha launches Nora upwards with her shield and thus, making Nora land on a designated area alongside Maginhild. After Pyrrha's passing, Jaune had to take her place as seen in "The Greatest Kingdom".
Ren pointed out when they group was temporarily Team RNJR with Ruby, that "junior" isn't a color/doesn't fit the Color Naming Rule. Though the word "junior" invokes the idea of bright colors in association with young children.