From Minecraft Wiki
Melon may refer to:
Melon (block) - a block grown from melon seeds which breaks into 3-7 Melon slices.
Melon - a food item which can be crafted into melon seeds, melon blocks, glistering melons, or can be eaten to restore 2 ().
Melon Seeds - an item that can be planted on farmland to grow melon blocks.
Glistering Melon - a craftable item used in brewing.
Melon Stem - the block that is planted on farmland when melon seeds are used on it.