With its semi-erect leaves and green pseudo-stem (from what I can see in the pics) and overall general appearance it fits the bill of the dwarf orinoco. I have some D.O. that are about the same size and look exactly like what you have in your pics.... but you probably wont know for sure until flowering/fruiting which is the easiest way to accurately gauge what you have.
here is a really good source of info (not necessarily on D.O. but many species in general)....
http://bananas.bioversityinternation...25/54/lang,en/
that is just the musa germplasm publications page... there is a lot more info on the site that you may find useful
Regards,
-James-