We all know that frogs feed on insects. Among these insects mosquitoes are some of its prey. Tadpoles on they other hand are more effective, they feed on the mosquito larvae. These Asian Painted Frogs (Kaloula pulchra) are too busy with other things, so some mosquitoes take their chance and feed on them.
Cupp and his colleagues (2006) investigated this matter back in 2003. They were investigating the role of amphibians and reptiles as a reservoir for eastern equine encephalomyelitis (EEE), a mosquito-borne disease that mainly affects horses but can also affect people. They found that the mosquitoes were feeding for approximately 25% on amphibians, but they main source of blood seemed to come from reptiles. They did not proof that amphibians and reptiles are important hosts for the virus, but there are some indications that point that way. mosquito feeding on frog
Cupp, E.W., D. Zhang, X. Yue, M.S. Cupp, C. Guyer, T.R. Sprenger and T.R. Unnasch. 2006. Identification of reptilian and amphibian blood meals from mosquitoes in an eastern equine encephalomyelitis virus focus in central Alabama, American Journal of Tropical Medicine and Hygiene. 71(3): 272–276.