What a wonderful find! Congratulations!
The best way to find the name of a plant is to ask the vendor. You could explain your case to Trader Joe's and ask them if they would be willing to provide you with the name of the grower.
Twinkles do come in many colors but I could not say if yours is one or not. It would probably be useful for you to know what you have as Twinkles don't need quite as much light and like more water than many other commonly sold Oncidiums. Good luck!