Do Lizardfolk Females have Breasts?

I know, that's a very strange title for an article. Bear with me though.

See, I was working on a prop for the new Fate game I'm running. It's sort of a crossover between Shadowrun, Call of Cthulhu, and Cowboy Bebop. But the important thing is that I was looking for images of lizardfolk to use in this prop. And I noticed that many of the images I was seeing displayed breasts on the females.

This struck me as odd, because reptiles don't have breasts. Breasts are a uniquely mammalian feature; in fact, that's where the word 'mammal' comes from: the Latin word mammalis, 'of the breast.' No other type of animal has mammary glands.