PBS Kids is the premium network channel from PBS, however it is so much more. With the online streaming service through Amazon you will have access to all the kids cartoons full series on demand.
It is worth noting that the PBS Kids service on Amazon is different to the direct PBS Kids service. The official channel https://pbskids.org/ will give you access to games, learning videos, puzzles challenges and is very much interactive, in addition to live TV. However you will not have access to the dozens of series on demamd.
Through the Amazon Channel free trial of PBS Kids you will have all the series on demand, however you do not get the interactive services.