FWIW I recently spent a few days in Holland with Ruud Schouten, owner of Rana. Ruud has over the duration of the last 20 - 25 years travelled many times to French Guyanna and was one of the first froggers to visit Regina, the locality of the regina morph. According to Ruud, the name Giant Orange originated when he exported frogs to John Uhern of reptile specialties in the early 1990's. John thought he could market them better as "Giant Orange" hence the name Giant Orange was born. Other later exportation from other european sources and to other american importers came in as regina, and regina they remained. So according to Ruud, and a few others Dutch hobbyiests I had the pleasure of speaking with, and who have seen these frogs in the biotope, they are one and the same.
I cannot expand any further than that, as I have neither been to French Guyanna, nor worked with either of these animals, but would be inclined to take their word for it. From experience with dozens of other species in the wild, the differences percieved between these two supposed morphs could very easily fall within the range of normal intrapopulational variation expressed amongst poison frogs.
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