They seem to be a fair weight, not underweight, and their poo is definitely normal. That's why I didn't think it could megacolon because their poo is normal and they don't seem underweight. I dunno, if it is megacolon what should I do? And are they ok to feed to the snakes?

They get fed your rattie diet, with lab blocks included and sometimes I mix it up a bit with what they get. Alfred is kept seperate from the females until 2 weeks after their babies are weaned.