There isn't a single, universally accepted alternative name for the stored food in seeds. However, depending on the context, you could use terms like:

* Endosperm: This is the most common and technically accurate term. It refers to the tissue within the seed that provides nourishment to the developing embryo.

* Seed reserves: This is a general term that encompasses all the stored food within a seed, including the endosperm and any other food-storing tissues.

* Nutritive tissue: This emphasizes the nutritional function of the stored food.

* Food supply: This is a more general term, but it captures the concept of the stored food being a source of sustenance for the developing plant.

Ultimately, the best alternative name will depend on the specific context and the audience you are addressing.