The Niederen Tauern are, same like the big brother Hohe Tauern, divided into different sub groups:
There are the Radstädter Tauern with nice splitboard beginner routes, Rottenmanner / Wölzer, the Seckauer Tauern and the Schladminger Tauern.
Starting points for splitboard touring in the Schladminger Tauern are Radstadt, Schladming and Murau. Highest peak is the Hochgolling (2862m).

Yet no splitboard routes in database for Niedere Tauern.
Love Splitboarding here: