It would do, but you might need a lot of them! You can burn cowpats (people do for cooking fires), and it doesn’t contribute to global warming as they are not a fossil fuel. They contain undigested plant material, which burns well.
BUT: if you don’t burn them correctly, you get lots of pollution from smoke. That’s a real problem in countries that use them for cooking fuel.
It might be better to get bacteria to digest them and produce methane as a fuel.
This will work – in a way. We can’t put the cow pat straight into the car, that wouldn’t work. What we can do though is put lots of cow pats into a big tank with bacteria. The bacteria will digest the cow pats and as a result give off a gas called methane. This is the gas that’s used in cookers in our homes. We can then use the gas to either drive the car or bus directly, or we can use it in a generator to make electricity which we can use to run the car or bus.
I know it sounds weird, but there is a guy that collects used up cooking oil from restaurants, etc, filters it all so that it’s clean (no chips left over in it), and then taxis can use it for fuel, but apparently each fuel smells of the take away that it’s come from, so you can have fish and chips fuel, or chinese take away fuel…