I've used these on my 10" tires.

StaiBC 10X2 Replacement Tire Tubes 10x1.90/2.125" Angled Valve Stem Compatible with 10x1.90 10x1.95 10 x 2.0 10 x 2.125 Most Kid Bike Tire tubesv/Scooter tire Tubes 2-Pack https://www.amazon.com/dp/B074N4WHXL?ref_=cm_sw_r_apann_dp_AD6AWYBMBS28ENDJ049J

But really sizing is pretty flexible with an inner tube. What happens when you inflate the inner tube is it expands to fill the tire no matter what the shape of the tire is. If there's too much tube material it might fold in on itself which can cause a problem with pinching creating a puncture, if there's too little material then it'll be too thin and might just break due to stress. Other than that it's usually okay.

Pardon the analogy but it's basically like a stretchy condom that is essentially just trying to create an air barrier. The size and shape of the tire is driven not by the tube but by the tire and hub and the inner tube is just there to create a barrier to contain the air injected into the tire. The synthetic rubber used in inner tubes is really elastic.

The only other thing you have to look out for is the shape of the stem. Scooters, because they have fat hubs in them, usually require an angled stem otherwise you can't get to the valve.

When you look at bicycles and tubes there's a lot of voodoo around them because riders can potentially get some benefit by getting the strongest and lightest material inside their bike tire just so they can reduce a few grams of weight. I never understood the obsession with reducing weight on a bike.

But these are scooters, even the kind of tubes you might put in a baby carriage, kiddy bike or riding lawn mower is going to work if you can fit them around the hub and they are smaller than the outer diameter of the tire.