Note
I don't plan on updating this for the forseeable future since I wrote this before I was aware of the LFHacks project, but if there are any updates they'll be over on Codeberg, not here on GitHub. Thanks!
These are some notes on my experience from ripping from silly LeapFrog products.
So, you may wonder how exactly we get any sort of asset from the LeapPad. Well, first we use something called LeapPad Manager to actually connect to the LeapPad and turn on 'developer mode' as per The Cutting Room Floor. It seems that you can also set up developer mode on a Linux host as per Clayton Carter but I haven't used that method to set the LeapPad into developer mode, only to setup the FTP interface.
At that point I used the details from the aforementioned guide from Clayton Carter, but instead of connecting via the command line, you can connect via your file manager. There should be an option like 'Connect to Server', but you may need to look around. In GNOME Files, you'd go to 'Other Locations' and type ftp://192.168.0.111 at the bottom. The LeapPad is always at this IP address. However, it will only expect an IP address from 192.168.0.xxx, so we have to set the IP to 192.168.0.1 for this to work. The username is root and there isn't a password. Most of the files will be stored under the LF folder, but some files may be stored in other places, i.e. /var.
Sounds will be stored in one of three formats, or even redundantly duplicated in one of them. They'll either be an MP3 file, an Ogg Vorbis file, or a WAV file with IMA ADPCM data.