是的，ActiveMQ Artemis可以将未发送的消息传递给STOMP客户端。下面是一个使用Java代码的示例：

import org.apache.activemq.artemis.api.core.TransportConfiguration;
import org.apache.activemq.artemis.api.core.client.*;
import org.apache.activemq.artemis.api.core.client.ActiveMQClient;
import org.apache.activemq.artemis.api.core.client.ClientMessage;
import org.apache.activemq.artemis.api.core.client.ServerLocator;

import javax.jms.Message;
import java.util.HashMap;
import java.util.Map;

public class StompClientExample {

    private static final String BROKER_URL = "tcp://localhost:61616";
    private static final String QUEUE_NAME = "myQueue";

    public static void main(String[] args) throws Exception {
        // 创建连接工厂
        ServerLocator serverLocator = ActiveMQClient.createServerLocator(BROKER_URL);
        ClientSessionFactory sessionFactory = serverLocator.createSessionFactory();

        // 创建会话
        ClientSession session = sessionFactory.createSession();

        // 创建STOMP连接
        Map stompHeaders = new HashMap<>();
        stompHeaders.put("accept-version", "1.2");
        stompHeaders.put("host", "localhost");
        StompClientConnection stompConnection = StompClientConnectionFactory.createClientConnection(session, new TransportConfiguration(NETTY_ACCEPTOR_FACTORY));

        // 连接STOMP服务端
        stompConnection.connect(stompHeaders);

        // 创建STOMP订阅
        StompFrame subscribeFrame = new ClientSubscribeFrame("sub-1", QUEUE_NAME, "auto");
        stompConnection.sendFrame(subscribeFrame);

        // 接收消息
        while (true) {
            StompFrame receiveFrame = stompConnection.receiveFrame();
            if (receiveFrame != null && receiveFrame instanceof StompMessageFrame) {
                StompMessageFrame messageFrame = (StompMessageFrame) receiveFrame;
                Message message = messageFrame.toMessage();

                // 处理消息
                System.out.println("Received message: " + message.getBody());

                // ACK消息
                StompFrame ackFrame = new ClientAcknowledgeFrame(messageFrame.getAckId());
                stompConnection.sendFrame(ackFrame);
            }
        }
    }
}

以上代码示例演示了如何使用ActiveMQ Artemis的STOMP协议与服务器进行通信，并从队列中接收消息。你可以根据自己的需求修改代码。