Toyota Motor Corporation said it will recall 3.8 million vehicles in the United States, the company’s largest-ever U.S. recall, to address problems with a removable floor mat that could cause accelerators to get stuck and lead to a crash. The recall will involve models such as the Toyota Camry, the top-selling passenger car in America, and the hybrid Prius. Toyota. said it is working to find a remedy and that owners could be notified as early as next week.