Yes, you can delete them.
On device, you can find them under Library/Previews (they are not shown on Library/Books). At least I can see them in there. And, I can delete them directly from device too.
EDIT. I seem to have habit of writing really unclear instructions. So lets try be more clear: On Kobo Touch, in homescreen, when you click Library button, there should be entry Previews available, where you can see all previews loaded to device.
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