The Victorinox are a bit dangerous, because they can snap on the finger.
I got my first one in the age of 6 and never did hurt myself with it. But I recommend the Opinel No6 Carbone, because this knife is made for the hand size of children, the blade isn't so long and after it got whet a bit the rust at the blade where it touches the wood of the handle makes a higher friction, so it becomes more secure.
My brother is a vegetable grower and here are flying a lot of No7 stainless around and I really hate them. It's no problem to sharpen them but in my opinion the friction is too low.
The Mora Companion has a far too large handle, even for a ten years old boy.
My nephew tried it out but returned to the Opinel No7 after we spoke about this point. He could take the Mora Companion or the Hultafors OK 4 but he takes the Opinel No7 which is even too large for him, because he lost his No6.
In my opinion the best option is a usual bushcraft knife with usual proportion but in small size.
I had such a knife since I was 5 years old and it was very convincing. I prefered to use it and not the Victorinox Spartan as long as I was a child.
The proportions of the Opinel No 6 are ideal in my opinion for a six years old child but I would prefere to gift such a knife as a fix blade version.
I was many years a boy scout leader too and do not see any reason for a round tip. They really are pointless in my opinion.
They are surely nice as breakfast knifes if the jam glass is nearly empty. But totally nonsense as first all purpose knifes.
Opinel sells the No6 since many decades.
The handle is sized for 5 to 10 years old children.
The relatively knew No7 round tip stainless versions are sized for 12 years old people who perhaps better should get a flexible plastic spoon, because it's too late anyway...
An interesting knife for older children which I only know from the internet is the Schnitzel Du.
Das Schnitzel DU und seine Vorteile stellen sich vor Sichere Handlage durch rutschfesten Griff aus G-10 Material G-10 ist ein leichtes und robustes Verbundmaterial. Es besteht aus Glasfasern und Epoxydharz, welches verpresst wird und Wettereinflüssen unerschrocken entgegentritt. Durch die...
www.schnitzel-germany.de
But there are other knifes too which surely would be a good option, for example the LionSteel M1-GOR.
Griffmaterial/Klingenstahl: G10/Böhler M390 Klingenlänge: 7,5 cm Gewicht: 95 g
www.knivesandtools.de