Etydhv

In Dune, Fremen travel regularly on the backs of enormous Sandworms (variously "Shai Hulud" or "the Maker"). They summon them through the use of a device called a "thumper" (presumably Frank Herbert didn't foresee smartphone apps) which is a metal device which bangs a heavy weight up and down causing vibrations which pisses off worms. A worm charges in to attack the thumper and while it is distracted, the Fremen climb aboard.

BUT - the thumper is destroyed every time. And even if it wasn't, the whole point is to distract the worm so you can mount, you wouldn't be able to climb back down and pick it up.

It just seems for it to make enough low-frequency noise to attract that kind of attention, its going to need to be at minimum the size of a bowling ball and have enough metal stake to poke into the ground (sand) deep enough to transfer the sound energy efficiently. Picturing 35 lbs at the very least.

And while the 1984 movie isn't necessarily canon, it did show thumpers as being pretty big as well.

I wouldn't want to carry ONE very far; let alone a half dozen for a long trip.

Additionally, the Fremen seem very insular and distrustful of each other and I find a thumper exchange philosophy, where one could stop at another sietch and borrow or buy one, to be very unlikely, yet they speak of long journeys as being "x" thumpers in length, which I understand to mean I had to summon x worms (which implies one thumper per trip-segment).

Where do they get all these thumpers?

We have a description of a thumper in Dune

Stilgar pulled a plastic rod about a meter long from beneath his robe.
The thing was pointed at one end, had a spring-wound clapper at the
other end. “I prepared this thumper myself. It’s a good one. Take it.”

and an image of one in the Dune Encyclopedia

If you were planning to make a long journey, carrying twenty of them (between several Fremen or in a large bag) doesn't seem especially onerous given that they're made out of light spice-plastic.