Mustard seed ta ho, tara that's the only one English term for both Raayo and Tori. They both llok same in shape and color, but in terms of size, Raayo is smaller than Tori. As far as I nkow, you can't get Raayo seeds in the US.

Saag ko kuraa garyaa ho bhane, Mustard Greens is the only English term for all kinds of variety of Mustard ko saag...like Tori ko saag and Raayo ko saag...you just have to know which one is which by looking at it.