There's a small, recent scholarly literature on this in computational linguistics, referring to these as "lexical blends". This journal article is the most prominent publication, I believe: <a href="http://www.mitpressjournals.org/doi/abs/10.1162/coli.2010.36.1.36104" rel="nofollow">http://www.mitpressjournals.org/doi/abs/10.1162/coli.2010.36...</a> . The first author, Paul Cook, did a dissertation on them.