Was thinking the same thing, this doesn't even look like the same art style.
Some research later. I think what we have here is a case of two artists using the tag name. There in fact appear to be quite a few Omochis out there. This one appears to be an (Omochi.) who is part of an Inarimochi. group I think.
Not sure if this should be brought up in the forums or not but we might need a new tag.