Amazon.com Inc. has looked at the possibility of expanding its retail footprint by acquiring some locations from bankrupt Toys “R” Us Inc., according to people with knowledge of the situation. The online giant isn’t interested in maintaining the Toys “R” Us brand, but has considered using the soon-to-be-vacant spaces for its own purposes, said the people, who asked not to be identified because the talks are private. Such a move would let Amazon quickly expand its brick-and-mortar presence, coming on the heels of buying Whole Foods Market Inc.