Females tend to be larger and more round than the males. Your frog doesn't look horribly bloated to me. But I have read that bloodworms can be bad for their systems and should only be fed as a treat. If you are using freeze dried bloodworms, this can be especially bad because they can expand in their stomachs.
Bloodworms and algae wafers alone are not enough to meet their nutritional needs. You should look for a high quality frog pellet to feed your frogs so you can make sure they are getting the proper nutrition.
This is how I make the food my frog eats:
http://www.myaquariumclub.com/frog-jello-3559.html