Does 3gp format work on Ipod Touch?

It is free with no limitation and easy to use. You can have a try, and here are some steps.
1,open the program, click add to find the video you want to convert.
2,setting. choose the mp4 as output format, and the folder you want to save your mp4 video in.
3,click start then wait till the process finished.
4,when you got the mp4 video, you can drag and drop it into the video folder in your mp4 player.

Pavtube iPod video converter, can convert AVI, MPEG, WMV, MOV, etc to Apple iPod video.

And I think this guide may can help you too.
you can't find anything like that. you can try finding the episodes in a format like mp4 or avi or wmv and using one of the converters I have provided below. MediaCoder (you can go to devices and choose the cell phone recorder which converts mainly for cell phone) will convert to 3gp and Oxelon will convert to 3gp and 3g2. Some phones use 3gp, some use 3g2. Try both formats and see which one works better.
MediaCoder -- audio/video converter, best for big jobs and customizing your output formats (like container, format, audio type, etc.)

Pavtube iPhone video converter, can convert AVI, MPEG, WMV, MOV, etc to Apple iPod video.

I recommend you a free tool that can help you download youtube video easily. and it can convert the donwloaded video to many portable player or mobile phone. such as, iPod, iPhone, Nokia, BlackBerry and son so.
en ,you can use this one- uSeesoft Total Video Converter
it is the bset 3GP video converter, PSP video converter, iPod video converter, and Zune video converter to convert any video format to your mobile phone, Sony PSP, iPod, Apple iPhone, Zune video player and other portable video players.

Video to 3GP Converter is a powerful 3GP converter which can convert all popular video files to 3GP video format such as AVI to 3GP, MPEG to 3GP, VOB to 3GP.

Beside downloading YouTube video, Next Video converter can also help you convert video and Rip DVD to most popular video formats including DVIX, Xv iD, MOVE, RM, RM VB, MPEG, VB, DVD, MV, and AVI to MPEG-4 movie format for iPod, PSP, PS3, iPhone, XBox360, Zune, Apple TV, Archos, iRiver PMP, Epson Player, Creative Zen, Rubi Blue, Sony Walkman, Commodore PMX, Palm TX, Game Boy, SmartDisk, Windows Mobile Smart phone, Nokia, BlackBerry, Ketti, LG, Sony-Ericssonon, Samsung mobile phone, etc.