Goods that that are normally consumed together, like peanut butter and jelly, are what kind of goods?

Goods that are normally consumed together are known as 'Complimentary Goods' i. e. they compliment one another.

Other examples include toothbrush and toothpaste or Car and Gasoline.

Car and Gasoline is a classic example of complementary goods since the increase or decrease in the demand for one product has a direct impact on the other.

For example, when Gasoline prices start to decline, there is generally an upward trend in the purchase of new cars and vice versa.