Frito-Lay, Inc. is an American subsidiary of PepsiCo that manufactures, markets, and sells corn chips, potato chips, and other snack foods. The primary snack food brands produced under the Frito-Lay name include Fritos corn chips, Cheetos cheese-flavored snacks; Doritos and Tostitos tortilla chips; Lay's and Ruffles potato chips; Rold Gold pretzels; and Walkers potato crisps (in the UK and Ireland). Each brand has generated annual worldwide sales over $1 billion in 2009.

Is it true that are doritos and tostitos made by the same company?
yes