No, to log in through The Roku Channel you would have to have subscribed through Roku, not directly with Noggin.
To access it on Roku install and use Noggin's own dedicated Roku app:
https://channelstore.roku.com/search/noggin
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X