If you go to the smile tool and then the spdef tab, you can scroll through them. The top screen tells you the number of the selected tile. However, it is really just a 16x16 pixel grid numbered left to right top to bottom starting at zero.
Actually, only the first few sprites are in order, some of the later ones are duplicated (but rotated differently) or different sizes.
you can also make a sprite of any area on the GRP by doing
SPSET id,x,y,width,height
