In the atv code file make sure you change the bitmap from the kenshin or what ever bike Data you used and copy the bit map from the toad file and remove the old file and add the toad bitmap. I know the toad only spawns in one spot but you could change that in the file and make them spawn in parking lots and stuff i think have'nt tryed it yet but i guess it wouldent be that hard to figure out. I made a back up of my save file and use vanilla cheat givetoad. It just saved me time rather than going and finding it were it spawns. So one i got everything all settled i could use it in my acctual game im going to make it into a mod when in
<Bitmap_Name>
<Filename>L_Toad.tga</Filename> Thats what you want to change the Bitmap name to.
</Bitmap_Name>
<ID>113</ID>