There continue to be sales of Dendrobates tinctorius "Tumucumaque" that are frequently accompanied by claims that they were legally imported into the US. So far to my knowledge, no one who has claimed that these frogs were legally imported into the US has been able to back that claim up with documentation.
All captive specimens of the morph were relatively recently smuggled out of nationally protected areas in Brazil or descended from those trafficked animals. Note that some websites (the largest in the general herp classified category, and the largest Dendrobatid forum) do not allow sales of this or some other animals that are 100% certain to be descended from trafficked stock.
Here's a nice write up on the morph by a Dart Den staff member that explains the issues and timeline of how this trafficked morph came to be in the US hobby. Its purpose is to give information "so you are better informed before making a purchase", a goal that is sadly not as common with sellers as one might hope:
https://www.oneillscrossing.com/2022...og-do-not-buy/