Final answer:
Chytridiomycosis, caused by the fungus Batrachochytrium dendrobatidis, is the infectious disease devastating populations of frogs in North America, Alaska, and Australia. The African clawed frog and the North American bullfrog play a role in the spread of this disease.
Step-by-step explanation:
The infectious disease devastating populations of frogs in North America, Alaska, and Australia is chytridiomycosis, caused by the fungus Batrachochytrium dendrobatidis. This fungus is native to Africa and may have been spread worldwide through the transport of the African clawed frog. The North American bullfrog can act as a reservoir for the disease.