These are definitely NOT gladiolus, because those corms do not have roots surrounding them, tend to have "last year's corm" attached to the bottom of this year's corm, and propagate themselves via very small cormels, not adult-sized corms. They are also definitely NOT ginger (I grow that myself; those rhizomes are elongated).
I think you may have small-sized calla lilies. To make sure, turn the bulbs over - if they're roundish on the bottom, with no roots, then they're probably callas. Adding a photo of the underside to your question would also help with an ID. Please let me know what you find via a comment, because if I'm wrong I'd like to delete this answer.
Regardless of what you have, I suggest that you keep them in a cool, dryish place for the rest of the winter, then either plant them in a pot or outside once danger of frost has passed. I think you'll be rewarded with a pretty cool plant! If you plant them outside and are in an area that gets colder than zone 8 (US) or so, you'll need to dig them up in the fall if you want to save them over the winter.