Yes however not knowing or having observed the animal in person it's hard for anyone to say if this is a normal sound or something is going on, when in doubt the best is to consult a vet and have a culture done if the culture is negative than what you hear is not abnormal.
There is no schedule, it can be a week a month or more, unless there is a PERSISTENT bulge near the cloaca the animal is fine.also we're feeding them twice a week how often should they poop? I'm worried they are backed up.
As for are you feeding enough not enough hard to tell since they are no info such as weight of the animal and prey size some people think they feed enough and worry about bowel movement when in fact they do not feed enough and the animal utilize most of the prey for growth, again it's about details.