It's a Calathea, probably warscewiczii. Certainly not a Croton. There's a lot of species and varieties of Calathea around but a lot of the common ones have similar requirements. They like good light but not direct sun light. Also need warmth with humidity. Soil needs to be kept moist but not wet/soggy. Check this link, it'll have all the information you need.
Calathea warscewiczii

Hi

Calatheas are some of my favorite plants besides dozens of varieties there are many hybrids . Figuring out an ID is really tough because of this there is also a closely related family called Maranta the main differece being the structure of the flowers and there are hybrids between the two lol

The culture is very similar for the various types As a house plant they are tough because of the need for high humidity and warmth . I have plenty of that so use them as garden plants though I do have to keep them in pots

These are often called "Prayer plants " because of the habit of folding the leaves at night or when they get too much light . Don't make the mistake I made in thinking they were wilting lol

They usually call that variety "Rabbit tracks " around here good luck gary

Not disputing any of the culture info above, from experience in actual tropical locations, but think the plant is Maranta (also called prayer plant):
http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=b604

Prayer plant

Thanks everyone! I'm in Nova Scotia so this plant may do well in the summer but it might struggle along in fall/winter. I had it in direct sunlight but moved it to a new spot. We'll see how it goes.

I'll have to defer to Tiffany's ID. Guess I'm used to seeing longer petioles/stems on the Marantas whereas the plant in the first post seemed more compact. But still, they do have fairly similar cultivation requirements.