You can use the ListThingTypes command to list thing types:
$ aws iot list-thing-types
The ListThingTypes command returns a list of the thing types defined in your AWS account:
{
"thingTypes": [
{
"thingTypeName": "LightBulb",
"thingTypeProperties": {
"searchableAttributes": [
"wattage",
"model"
],
"thingTypeDescription": "light bulb type"
},
"thingTypeMetadata": {
"deprecated": false,
"creationDate": 1468423800950
}
}
]
}