They might not even be mutations because the DNA its soo complex.
All europeans and asian people come from just 200 human individuals iet we are soo different genetically from person to person.
I grow a few ,,unusual,, fruits like the red fleshed apples,a pink fleshed pear and a giant walnuts the size of a human fist with the green husk attached( biggest walnuts in the world).
When i was colecting pecans i found a lot of variation among them,somme had perfectly round nuts,otther long but tiny nuts and so on but i dont think these shapes are mutations but come from the diverse genes the trees have in their DNA.