There are no such words beginning with "ip" except for "i-pod".
//as far as I know//
^^^
Edit
There are a few IP wprds but they are all obscure.
Words that begin with IP include Ipecac(s), Ipecacuanha(s), Ipsilateral(ly), Ipomoea(s), and Iproniazid(s).
and of course iPod/iPhone ...