The Nexus 7 is a tablet manufactured by ASUS, but developed by Google.
It is a tablet, which makes it a mobile device.
No, at this writing Poptropica is not available for any Android device, which includes the Nexus 7. Only a game cheats app is available.
Move the files from the SD card to a computer. Then connect your device to the computer via USB cable and move them to the Nexus 7.
There's currently no iTunes app for the Nexus 7, or for Android OS in general. However, there are various syncing apps where you can sync downloaded content from iTunes to any Android-powered device, which includes the Nexus 7.
Yes, it is possible to copy the files from a Nexus 7 to a computer via micro USB cable (or use an app such as Air Droid without the need of a cable), then transfer them over to another Nexus 7. You can also send files directly from one Nexus 7 to another one (or really any Android device to another Android device) either by NFC or Android Beam.
It is a small hole located at the top of the device, around the back.
You can play Gameloft games on any Android device, including the Nexus 7. A number of their titles are also optimized for the full tablet experience.
There's no real fix to the Nexus 7 charger, but you can use a standard micro USB charger, or a wireless charger (Qi standard) to recharge the device.
Check to make sure the Nexus 7 has been charged. It's a good rule of thumb to charge the device when you first unbox it prior to starting it up.
There are various types of Nexus devices, but the Nexus 7 is part of that same family.
The 2012 Nexus 7 came out on July 2012. The 2013 Nexus 7 came out on July 2013.
The 2012 Nexus 7 debuted on July 2012. The 2013 Nexus 7 debuted on July 2013 (August 2013 in Canada).