No, inflation is a monetary and political phenomenon. Companies cannot set prices arbitrarily, in particular not the fast food industry which faces what is probably the strongest competition on the planet. The entire restaurant industry does not collude on the prices of burgers.

In this particular case it's wage-push inflation. The lowest quintile of workers has seen very strong wage gains among other reasons because of tight labour markets and minimum wage legislation, which on the consumer side prices a lot of people out of the service economy.