The dog characters in Undertale are;
Doggo,
Dogamy,
Dogaressa,
Lesser Dog,
Greater Dog,
'The Annoying Dog' / Little White Dog
'Endogeny' - this is an amalgamated form made up from several deceased, and subsequently revived dog characters including the parents of the other dogs.
A lot
Undertale was created by Toby Fox, a game developer for the Mother series. You can actually find him in Earthbound as a dog in the shop in Onett. After Undertale, he later went on to create Deltarune Chapter One. Toby Fox's true identity is yet to be fully revealed.
Yes, you can play Undertale on a Chromebook by using a few different methods. One option is to use a platform like Steam through a Linux installation, as Undertale is available on Steam. Alternatively, you can use an online emulator or cloud gaming service that supports Undertale. However, performance may vary depending on the method you choose and your Chromebook's specifications.
Yes but no at the same time
yes
Sans
Sun Flower
yes yes he did
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Undertale
Toby Fox. He also I believe he "developed" Pokemon sun and moon, or sword and shield.
You buy it from Nintendo switch, steam, xbox, or PlayStation.