Karl Townsend asked:

That is an endmill with a smaller shank than the cutting
edges. One with something like a 1/2 inch shank and a 3/4" diameter
cutter. is there a name for for this type of endmill?

Karl, I call them "end mills". The cutting body can be any length, and
any reasonable diameter -- it's not dependent upon the shank diameter,
except the shank has to be large enough to take the maximum cutting loads
of the bit.

I have a fairly large collection of endmills with larger cutting
diameters than their shanks -- like 1" diameter cut with a 1/2" shank.

But it really sounds like you're looking for 'slotting cutters', and a
woodruff key cutter is one form. Check out www.msc-direct.com, and
search for "slotting cutter". Don't buy one there, just look. The
prices are out of sight.

LLoyd