Farkaš won the gold with a jump of 8.17 metres.
The silver medal went to Luka Bošković of Serbia (7.93m) and the bronze to Mason McGroder of Australia (7.80m).
Wild captured her silver in the 100-metre hurdles with her second-best personal time of 13.15. The gold went to Kerrica Hill of Jamaica (12.99) while the bronze was won by Delta Amidzovski of Australia (13.24).
Croatian track-and-field athletes have won two gold medals (heptathlon athlete Jana Koščak and Roko Farkaš) and one silver (Mia Wild) at the championships in Lima.
So far, Croatian juniors have won a total of nine gold medals at world championships.