can computer connect to a google phone and use google phone speaker

 Yes, you can use a Google phone (Android) as a speaker for your computer using third-party applications. The most common method is using apps like AudioRelay or M-Speaker, which stream audio from your Windows/Mac/Linux computer to your phone via Wi-Fi or USB cable, allowing you to use the phone as a wireless speaker. 

This video demonstrates how to use your Android phone as a speaker for your PC via Wi-Fi or USB:

How to Use Your Phone as a PC Speaker (AudioRelay):

• Setup: Download and install the AudioRelay app on both your Android phone (from the Play Store) and your PC.
• Connection (Wi-Fi): Ensure both devices are connected to the same Wi-Fi network. Open the app on both, and your PC should appear in the "Server" list in the phone app.
• Connection (USB): Connect your phone to the PC via USB, enable USB tethering in your phone's settings, and select the USB option in the AudioRelay app.
• Audio Output: In the desktop app, select "AudioRelay Virtual Sound Device" as your speaker output to route sound to your phone. 

Alternatives:

• Bluetooth: While not a native PC-to-phone audio streaming tool, you can use apps designed for Bluetooth audio streaming, though Wi-Fi/USB typically offers lower latency.
• Google Home: If you mean a Google Nest speaker, you can pair it via Bluetooth to your PC in the Google Home app settings.