Could my male be a female?

[Bogertophis]

...Given he was mislabeled, I wonder if he is actually a she. Any thoughts on whether that growth is normal for a male? I wish I knew how to "pop" him and check but I don't want to take any chances of hurting him.

Pet stores in general aren't very reliable about the gender or morphs of snakes they sell; you're actually "lucky" if you manage to get appropriate care instructions from them. So I'd say it's possible that "he" is a "she", & it would be helpful for you to know, as females do tend to eat & grow more than males, & may eventually need a larger home too.

If there's no breeders or experienced keepers near you that you'd trust to help sex your BP, you can always have an experienced herp vet verify the gender for you. This site may help:

https://arav.site-ym.com/search/custom.asp?id=3661