One of my toes on my right foot is much bigger than that same toe on my left foot. all the other toes are normal sizes. is this normal?

Large digit: You should have a xray both feet to compare the bone size. Would not want to miss a bone mass. See a foot specialist. They usually have xrays that can be done in the office. Good luck

Big Toe.: In the general scheme of things, no, it's not normal. If, however, it does not present a problem, leave it alone. Toes can enlarge for many reasons. A recently enlarging toe, would necessitate a further looking into. Either way, to find the cause you will need to seek the advice of a specialist.