For this challenge, you must pull down 5 purple clay frog totems, all of which can be found in the southwest section of the city. The totem locations are marked with purple dots on the annotated level map and shown in these screenshots.
Before or after speaking with Moraekah, use a rope arrow to pull down the pole with the purple frog totem for the Changing the Weather Challenge.
Lara can't use her weapons in the city, but you can target the rope coil holding up the totem in order to pull it down.
There's another frog totem outside the south door of the same building where the first one was hanging.
South of the first two totems, there's another frog totem hanging in front of a building next to a long flight of stairs.
Down the steps to the east of the Fluent Yucatec monolith, where the orator in the gold mask is getting the crowd all riled up, there's a tall, white house with a cultist guard standing outside. A frog totem is hanging outside the upper window.
A short distance to the northwest of Moraekah and the first two totems there's a white house with blue cloth and another frog totem hanging outside.