They look like a bunch of different species, but they are a single species, with lots of varieties. They are also dendrobatids. They are Dendrobates auratus. Each variety has a particular geographic distribution, and the variety name refers to the location: Caribbean, Calobre, San Felix … well, except my favourit variety, which is the Bronze. These frogs live in Central America. It´s size is between 30 and 35 mm, so they are not the smallest dendrobatids. These are the ones I made.
If you want to buy any, are in my shop.