Galahad Schwartz and the Cockroach Army — Morgan Nyberg

Young Galahad lives in the jungle. He plays with snakes and crocodiles.
Then everything changes. He's sent to a big city slum!
There he confronts evil. But he also finds magic!
You'll boo the exterminator! You'll cheer for the cockroaches!
Join Galahad in his thrilling adventure!

Galahad Schwartz calls a South American jungle his home. His parents are adventurers and Nobel Prize-winning authors. But when they fail to return from an expedition in their hot-air balloon Galahad must leave the jungle to live with his grandfather in a North American slum. There he learns that the jungle and the city have some things in common!

Galahad Schwartz and the Cockroach Army won Canada's Governor General's Award for Young People's Literature. (See the Governor General's Awards Website https://ggbooks.ca/past-winners-and-finalists).