Imo is like a Japanese potato. Don't these look like Totoro?? Er...brown Totoros? They're kinda slimy and slippery and are really difficult to skin (I cut myself at least three times using a safe-ish peeler). I kept dropping them on the ground.
Here's what they look like peeled and cooked (on the left). Carrots, shiitake, and daikon on the right: