Allow me to follow up here.
You will need root access to the server to pull this off. Also you will need ImageMagick installed.
Process:
Get all of your full size images. (I did it like this:)
[code:1]
cd images/comprofiler/
mkdir ./thumbs
//get all the images
cp ./* ./thumbs
cd thumbs
// remove the non full size images
rm ./tn*
//use image magick to resize (use your own dimentions)
mogrify -resize 80x80 ./*
[/code:1]
Ok, good. Now download a program called ant renamer. Also use FTP to download the thumbs folder. Use ant renamer to rename the files; Use the "regular expression" option. replace ^ with tn. That should put a tn in front of all of your files. Now upload the renamed files to images/comprofiler/
Hope this helps... I'm not sure what plugins you guys are using.