"Sqweeks" one comes up with one record http://tmsearch.uspto.gov/bin/showfi...802:pm3uqt.3.1.
"Squeaks" appears to be super popular with a plethora of kids toys http://tmsearch.uspto.gov/bin/showfi...h=Submit+Query.

So it seems like they were just trying to be safe than sorry (fyi - from what I've read, the opposition process can be lengthy and painful).