Not quite Michael. They can be forged from pipe by a blacksmith. Start with the major diameter then draw it out and taper it to length and minor diameter.

But we still dont understand the finished design are the tentacles purely decorative or are they partially or fully structural? Makes a big difference to the possible methods of manufacture.

They could be solid forged steel, hollow forged, fabricated, cast, made out of something other than metal and sprayed with metal mist.

Not enough info supplied.