There are currently no stoves on the market that operate at 120 V. However, small appliances such as toaster ovens are designed to operate at 120 V. Based on our understanding of your question, you would like to know if cooking with a toaster oven rather than a conventional oven uses less energy.
Stoves are some of the largest consumers of energy in the house. An excellent move to make is to use smaller appliances instead of the stove as often as you can.
Just to give you an idea: did you know that a slow cooker uses up to 80% less electricity than a stove?
We encourage you to visit our ENERGY WISE Web site, where you can find tools to help you calculate the consumption of your appliances.