How do I find my iPod touch in the house

Did you turned ON the "find my iPhone" service in the iCloud settings of your iPod? If yes,

download "Find my iPhone" app in your iPad. Sign in with the Apple ID that you use for the iPod.

Your iPod must be connected to a Wi-Fi network.

If you've enabled the "Find my iPod" festure, then when you go to the iCloud Page for finding the device, you should have the option to play a sound on the device. If you use that option, it might help you to locate it within your house based on the sound. I know I have used similar when my wife misplaces her iPhone. I often call it so she can hear it ringing and locate it that way.