Yes, but barely.  There really is a tail under there.  Most hedgehogs have
only a pointed little nub of tail that spends almost all of its time hidden
under the quills.  This leaves the poor hedgehog looking for all the world
like he doesn't have a tail.

Here are a few interesting words from Katherine Long on hedgehog tails:

    My hhog, Ambergris, uses her tail - it isn't a useless appendage.  
    She uses it as a pusher when she is trying to go underneath stuff.  
    Strange and wondrous.