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No. While the plant gets its name from the similarity of its fruit to blackberries, unlike blackberry fruit these are poisonous if ingested. If you have any small children or pets around, I would suggest getting rid of the fruits so they cannot be eaten by mistake.

They do not need to be cut back, nor do the irises. Allow the foliage to die back naturally, as the plants need this for producing enough energy to go into next year's blooms. You can, however, cut back any old blooms and stems down to the base.

This plant may not be the best choice for a container plant.
A relative to the iris, the rhizomes can grow to quickly in a pot and require frequent repotting.
It also may be sensitive to watering issues in a pot.

If you only have space for growing in pots and really want to try a Leopard Lily, you certainly can give it a try!

Here is a link with more information.

https://www.gardeningknowhow.com/ornamental/bulbs/blackberry-lily/growing-blackberry-lilies.htm

Blackberry Lily spread through rhizomes and can be divided or shared as you would an Iris plant.
You can harvest seeds from your plants in the fall before they drop from the plant.
Dry and store the seeds in a cool location.

https://www.gardeningknowhow.com/ornamental/bulbs/iris/dividing-transplanting-iris.htm

You can plant the seeds outdoors in the fall. To have more reliable establishment, first cold-stratify the seeds as described here:

https://www.gardeningknowhow.com/garden-how-to/seeds/seed-stratification.htm

Plant the stratified seeds indoors in the early spring, keep moist until they germinate, then transplant outside after the risk of frost has passed.

Collect the seeds in the fall when the seed pods open up. You can plant them outdoors immediately, and they will germinate in the spring, or you can store them in the refrigerator until spring and then plant outdoors. The seeds can take a while to germinate, so be patient.