there are a bunch. check out the pictures (Alocasia) on the agristarts website, it should give you an idea of what is out there.

Here's a nice small one...josh

Here is a link that might be useful: Small Colocasia

I think PD also carries 'Ruffles', which is 36" at maturity. To me, that's small, but it may not be to you.

Susan

Wellspring100 sells a dwarf form of Black Magic on ebay that would work for you.

I don't believe that Fallax can be grown as an aquatic, I may be in error but it is one I have never seen grown that way. I grow it in my yard as a terrestrial, and I can tell you, in my zone at least, it can be quite invasive.

I also grow "Ruffles" and it doesn't stay that small, it can get to 4-5 ft tall and the leaves get very large.

A very nice dwarf plant you might try is Dwarf Jenningsii, it looks like a miniature Colocasia antiquorum Illustris (Imperial Taro) but it can be hard to locate and pricey