A formula fed baby can have different colors of poop which are normal for the formula fed baby.
The normal colors of poop for formula fed babies are green, tan, yellow and even brown.
Basically any color of poop is normal for a formula fed baby as long as the poop doesn't contain any traces of blood.
Formula Fed babies poop is a bit firmer than a breastfed babies poop and will be about the consistency of peanut butter.