First try with an app called Stop Motion

 

Corky Escapes

Aside from 

• the difficulty of keeping an ipad steady,
• the little bits of stuff I used to keep the objects in place and my arm in the last frame,
• and the small image size, which seems to be a limitation of uploading directly to blogger,

I like the results. 
For the images, the app was easy to use and rendered quickly. I shot it in about half an hour. It has some nice features for shooting: 

• You can switch to a timer--the smallest increment is 5 seconds--while you shoot. 
• Enable or disable auto focus (discovered that too late). 
• Superimpose a grid and/or onion skin.  

Manipulating the timing afterwards with holds was simple and fast, and you can output in HD or three other resolutions. (This blog doesn't seem to support the output very well, though.)
Adding sound on the timeline is a little tricky, I found it hard to match the sound up to the action accurately. You can record your own sound or use music which I assume must be from itunes. Haven't quite figured that out yet. Only two tracks are allowed.