Caladiums.

I've read that these are grown from bulbs, corms, or tubers, so I'm not sure which one is correct.

My folks that are also my neighbors grow them, I was just over there delivering some green beans and cucumbers and took a photo of theirs.

Beautiful, kars.

Tuber would be the correct answer.
One of the best shade plants to grow ever and grow very well in poor moist red clay soil like I have in my forest yard.
Here is a good link that shows the difference between all these confusing bulb tuber rhizome corm and so on things.
https://www.google.com/url?sa=t&rct=j&q ... lA6Q9bVekl