Do the data indicate that the chytrid caused or is correlated to the drop in frog numbers?

Yes. Data has shown impacts of chytrids on amphibian populations. Frogs belong to the amphibians group.

Explanation:

Scientists have shown concerns over the declining amphibian populations, that had previously been common and abundant in the remote or protected areas. The publication of the IUCN Global Amphibian Assessment showed that 43% of amphibian species were in decline and 32% of species threatened.

Chytridiomycosis is an emerging infectious disease of amphibians that affects over 700 species on all continents where amphibians occur; some species have been driven extinct, populations of others have declined severely, whereas still others have not obviously declined.

However, there is still a lack of basic information on numbers of amphibian species, population sizes, trends in occupancy and abundance, and how chytrids are impacting any of these estimates.

you answered your own : -/