well according the the article that ! posted in the previous comments, the Witches' Market is not completely tourist free.

Bolivians and tourists flock to the Witches' Market, which has spilled into the adjoining streets.

Smiling witches in colorful full dresses and bowler hats—a fashion for women in Bolivia—preside over many of the shops with their daughters and heirs.

and

"It used to be only regular Bolivian customers coming to me for cures to health and spiritual problems," Acho says. "Now much of the money I make is from selling my goods to tourists who take them home as souvenirs. I feel something is lost in being a witch." read more here

Acho can rest assured that her frog is not just a souvenir in this house.