Snom
According to Bulbapedia,
"Snom's voracious appetite in Pokémon Camp is likely a reference to Saturniidae biology, in which the caterpillars eat a large stockpile of food due to losing the ability to eat upon becoming moths."
I think that Snom could be:
Snow | frozen precipitation
Worm | soft bodied invertabrate
Nom | Slang for eating
I personally do not agree with Snom coming from "Moth", that's more it's evolution, Frosmoth for me.
Toxtricity
I think it is probably Toxic, but Toxicity is another viable option I think.
"Toxicity: The quality or degree of being toxic". That's what I think.
Applin
I believe that it isn't Apple, but Apple + In. It's Sword Dex entry states
"It spends its entire life inside an apple". This means that it is a small Dragon of sorts living inside the apple. Just my opinion though, not sure if I am right :)
Togedemaru
Just a small thing, "de" can mean of in some languages, so basically Togedemaru is Round of Thorns lol (Or Thorn of Rounds if you prefer)
Dottler
Most likely comes from Dot and Doppler. Dot being, well, a dot, and a Doppler which I think is a kind of radio?
Drakloak
The fact that the name is Drakloak and not Dragloak probably means that the name is Drake-cloak not Dragon-cloak.
Arboliva
Simple change; "Arbol" is Spanish for tree. Arboretum is listed and makes sense, but considering the fact that Paldea is based on the Iberian peninsula, "arbol" seems like it fits just as well.
Hope this is alright :D