Yeah, unfortunately any apps for mobile are unrelated to the official wigglypaint.
I've seen some wigglypaint animations, though!
Youtube user 角赤pulupo has posted wiggly animations on their youtube channel ... sometimes using their own personal modified Wigglypaint (it's blue and has a larger range of colors than default wigglypaint).
There's also been wigglypaint video meme(?) where people draw a series of wiggly images to match a vocaloid song. Here's one that's more animated than the purely slideshow types. I think sometimes people use screen capture for this format. And some of these have mixed other animation tools in while still using the wigglypaint user interface like this one.
And then there's this other short animation someone made that I think is really cute. (It definitely used tools outside of wigglypaint to connect everything together)
That's what I can remember quickly enough to find links, haha.
I'm sorry that there's not a specific easy answer in here, but maybe there's some food for thought in all of this. I do animate in decker, but not with wigglypaint specifically.... I know it's definitely very possible to create new tools inside of decker to help you make animations (I have a non-wiggly onion skin helper tool that I made for myself). I think it's just a matter of knowing what you want those tools to do in relation to how wigglypaint already works -- and then making them.