Issue with StandardFirmata and Arduino Mega 2560

Those are to turn on LED's which are connected to digital pins. I thought I had defined my photoresistors as analog pins at the top by doing this at the top:

int cowPin = 3;
int sheepPin = 4;
int unicornPin = 5;
int frogPin = 7;
int dinosaurPin = 6;

and then this in the draw:

int unicornValue =  arduino.analogRead(unicornPin);

I defined cowPin, sheepPin or unicornPin like that and they work fine, so I'm very confused why frogPin and dinosaurPin won't print in any data