Yes. Diploid bananas have seeds.
Triploid bananas do not. These are two types of bananas. The vast majority of commercial bananas are seedless, because people don’t like seeds. By Cross breeding the bananas are produce that do not have seeds. Sometimes you observe black dots in the banana you bought, these are banana seeds, but do not develop. Bananas used for reproduction are different. How?............The banana (a plant not a tree) produces rhizomes from the ‘mother’ plant, from which shoots (‘suckers’) are removed and grown as the next generation.