[Dustin pls. There are no good shortcuts to looking after pets! Especially pet monsters...]

It's possible for different species to be transported by humans from one continent to another, though I can't imagine why anyone would want to transport a pollywog. Or, for that matter, how or why it might have ended up in your trash.

Ah!

[He held up his hand again as another thought occurred to him.]

If there were articles of food in the trash that were luring insects, perhaps Dart was attracted to those.