Yes, there are cultivated varieties that have been bred to be thornless.
They can be purchased from many garden catalogs.
Here’s an example.
“Semi-erect, thornless blackberries were first developed at the John Innes Centre in Norwich, UK, and subsequently by the USDA-ARS in Beltsville, Maryland.” These berries are crown forming, very vigorous, but need a trellis for support.
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