We call them "Theissen" berries here. They're very tatsy!
So you live in Harris County now? If you live north or northwest you're not too far from us...we are in the Tomball area.The blackberries needed to be weeded and thinned out every so many years.* .. they became a thicket of vines if left alone too long.
I lived out in Harris Cty., along a drainage ditch at the end of a dead end road .... kinda country living.
* All of which will be history soon as it's county easement, and they are in the process of clearing out and widening bayou ditches for the new flood plan.
How about hazelnuts? They are great if you can get them before the squirrels.I like eating berries better than picking them. When I was very young I remember picking blackberries for my father, and he enjoyed them with milk or cream and sugar. On camping trips in different areas, we've picked wild strawberries, raspberries, cranberries, blueberries, blackberries, huckleberries, etc.