We Are in a Bit of a Color Pickle

We have been trying to teach Carter his colors for sometime now. He knows several colors without fail; blue, pink, and orange. Well, as we have posted before Carter is totally infatuated with Thomas the Train. So, to encourage him learning his colors, we would ask him what color the trains are. We would say "What color is Percy? Percy is GREEN. What color is Thomas? Thomas is BLUE" and so on and so on.
So, when Santa was sweet enough to go against all of our best parenting rules and place a small container of mini M&Ms in Carter's stocking we figured we would take advantage of the colors. We would pour a small amount of M&Ms on the table and ask Carter what color they were. If he got it right, he could eat it.
What's the pickle you ask? Well, when we ask Carter what color they are we don't hear blue, green or red, we hear Thomas, Percy and James. So if something is green, Carter says the color is Percy, which is the green train, etc... Hoo Hum.
We parent on...