This seems really tough, at first glance i thought Matecho, Matecho, Matecho, Then I read all the posts to see what other said, and saw what it was sold to you as, I saw Yellowback and i almost agreed that it could be yellowback, but ive never seen a yellowback with that much yellow on the legs, but still doesn't mean that its not. As for the La Fume, i don't know much about this morph at all but what from what I saw from a quick bit of research I didn't see any with as much yellow as the one u originally posted. Again that doesn't mean that its not a La fume, My yellowback parents look like Saul, and they throw some that look like saul and some that are a "High Yellow". I think you need to find the original breeder of this frog, go see the parents and get to the bottom of it, because right now Im saying it could be Matecho, Yellowback, Regina, La Fume. I wouldnt go off as much of a color thing Orange/Yellow , because some give there tads lots of color enhancers some dont, With my personal experience with that is with citronella, if I dont give them any enhancers as tads, they morph out a very pale yellow, as opposed to when i do feed enhancers they come out Bright Lemon Yellow
Here is a very similar La Fume:
http://www.wildsky.sakura.ne.jp/frogs/dtinclafume05.jpg
Regina
http://i11.photobucket.com/albums/a153/sports_doc/IMG_6927-1.jpg
Yellow Back
http://www.sndartfrogs.com/img/tinc/t-yellbk4085.jpg
Matecho
Matecho that look like La Fume
http://www.flickr.com/photos/pendensproditor/5434015988/
and ones that dont
http://media.photobucket.com/image/dendrobates tinctorius matecho/twinspot/IMG_5900.jpg