Here's a video about a guy who went to the Amazon to find a frog called Phyllomedusa Bicolor (the Sapo, The Doctor):

http://www.vbs.tv/video.php?id=24888645001

In the sixth part of nine he meets with the shaman Don Ramiro (known from other videos as well) to get some Ayahuasca (vine, not real aya):

http://www.vbs.tv/video.php?id=24887073001

In the sevent part he finally finds a frog. He experiences it's venom's effects in the eighth part.

In the ninth part he gets some Psychotria Viridis leaves and prepares the famous Ayahuasca brew:

http://www.vbs.tv/video.php?id=24887086001

Interesting I dont have a clue what the actives are in the Sapo frogs. From what i can tell one becomes violently ill then receives a tonic effect that last some time. I could be wrong but I would not be surprised to find this pratice dangerous.