Hi Jason. Looks like we posted simultaneously. Bananas are usually propagated by and from the corms. Corms are a ball like growth that grow off the root zone of an existing plant. Some of the corms will already have a plant starting from them when planted, but even just the corm ball can be planted. In Hawaii they call these keiki, which means baby, but the proper Hawaiian name for plant starts is pula pula, or something like that.
I figured that it was likely that they were starting from seed, but there are not really any good bananas that also produce seed which is why farmers and gardeners always propagate by live tissue such as the corm.
Whether its a cavandesh, williams, ice cream, or the popular apple banana, the fruit can be split down the middle and tiny brown dots can be seen. These are the seeds. If you have a store bought banana from the super market you should be able to make the same observation. I was always told when I was young that that little nub that no one likes to eat on the bottom end of the banana was the seed but this is incorrect. There's hundreds of unviable seeds from the top to the bottom in the core of the fruit.
Pineapples also produce seed but are not usually propagated that way. I have some pineapple seed that I collected from fruits but never propagated. They are uncommon. When the pineapple fruit is young, its outer skin (the part that looks pine conish) will have small flowers poking out all over the skin. When the fruit is ripe the seeds can some times be found if you eat the fruit right up to where it starts to become fruit. The seeds are often times undeveloped and not likely viable.