Some have them on crew, or meet them in Gullet, but where do they all come from? Where is the frog home world? Are they all from Darkmoor, or somewhere else? They seem too few in Skull Island for that to be the source of all frogs. Are they from Valencia?

They just come from Skull Island. No special clans or guild

It seems like the frogs in Skull Island are not very common there, unless you mean troggies. I refer to the frogs who are like Fan Flanders, Tricky Vinnie, and the Frogfather. Skull Island residents seem to lean towards troggies and watermoles, and maybe rats, thought they may have travelled there, as the dogs did.

There were a few frogs in Marleybone, but mostly that seems to be the cat and dog world. Maybe the frogs are also from Albion, like the foxes. They seem to like to travel, but there doesn't seem to be a large population in any particular place we've seen yet. If from troubled Albion, it would make sense that they would have reason to seek better prospects in Marleybone and Skull Island.

I don't think Fan Flanders looked like she was born to a troggy family. I'm open to the possibility that there could be another world where the frogs are many, and prominent. Maybe they would have a Frog Prince. Most frogs sound Marleybonian, but not the Frogfather.

CdeWinter on Jun 25, 2017 wrote:

I think the frogs come from Marleybone, and represent the Welsh. At least that way you have: Dogs as English, Foxes as Scottish, Cats for Irish, and Frogs for Welsh.

But the frogs in Marleybone are different from the Skull Island Frogs. Perhaps the Marleybone frogs are actually toads?

Although, I can't see KI making the mistake of having Frogs native to Polaris, so that's probably out.

Troggies represent the "poison arrow" frogs of South America, also its a combination of tree + frog for their name.
I don't see exactly how the MB frogs could be from Wales, at least I haven't noticed Welch names or accents, but I'll take your word for it
Polaris is just too cold for amphibians.

Troggies seem to be tree frogs, though with the dart guns, might be poison arrow frogs too. Ones like Fan are frogs of another kind. The toads are in Cool Ranch. I find the Frog father's accent interesting; could it be that he is from somewhere similar to Sicily? It does seem to make sense that the frogs would be from somewhere near Marleybone.

CdeWinter on Jun 26, 2017 wrote:

There are toads in Cool Ranch. I was remarking that the Skull Island Frogs, or better, the Pirate Frogs, such as Fran, Tricky Vinnie, The Frogfather etc are shorter and of a darker green colour than the taller and paler Marleybonean street sweeper (chimney sweep? I don't quite remember) frogs.

My comment about Polaris, wasn't about the cold. Some frog species do very well in cold climates and can survive being frozen solid. I was more referring to "Frog" being a derogatory nickname for someone of French heritage, especially from France or Quebec. I didn't think KI would make the the mistake of having frogs native to world partly inspired by France.

Yes, those frogs in W101 ( the street sweepers ) have a The Wind in the Willows appearance but they seem to have Cockney accents.. I knew about "frog" being a derogatory term for the French, I was hoping it wouldn't come up.
And actually, Walrus, Polar Bears and Penguins wouldn't be associating with each other, since, as you know, the first two are Northern Artic animals, while penguins are from the Southern polar regions.