bedrock-samples/resource_pack/animation_controllers/tadpole.animation_controllers.json

{
	"format_version": "1.10.0",
	"animation_controllers": {
		"controller.animation.tadpole.general": {
			"initial_state": "default",
			"states": {
				"default": {
					"animations": [
						{ "swim": "math.min(1.0, query.modified_move_speed * 10)" }
					]
				}
			}
		}
	}
}