With all of my searching I found a few apps which focused exclusively on odd and even numbers. I have also included some ten frame apps which you could use to talk about and play to identify odd and even numbers
https://itunes.apple.com/au/app/10-frame-fill/id418083871?mt=8 This is a free app.
https://itunes.apple.com/au/app/friends-of-ten/id488573871?mt=8 – this app does cost .99. Have pasted a you tube video below so you can see what the app looks like.
https://itunes.apple.com/us/app/odd-even-numbers/id510018914?mt=8 – This app does cost $2.99 and consists of several challenges for the children (they need to identify odd and even numbers)