TinyGPS (Plus) Library
There doesn't seem to be, but what you could do is print each character as it arrives. From their example code:

  while (nss.available())
  {
    if (gps.encode(nss.read()))    // &lt;--- pass to TinyGPS
      return true;
  }


So, change that to be:

  while (nss.available())
  {
    char c = nss.read();  // &lt;--- get the incoming character
    Serial.print (c);     // &lt;--- print it
    if (gps.encode(c))    // &lt;--- now pass it to TinyGPS
      return true;
  }