A Chinese Hamster

The other day my niece turned up clutching her newest birthday present.  I asked what it was and was proudly told it was a zoo zoo hamster.  Now I'd heard of these before but this time I was shown the box.  

So Zoo Zoo was actually written Zhu Zhu!  I assume therefore this is possibly a pinyin word.  If this is the case it really interested me for two reasons.

1) I have seen an awful lot of toys in Britain over the years made in china, pretty much everything!.  I have never seen one that was actually marketed with a Chinese name.

2) I've seen this ignoring of the H before in the way every one in the office pronounces ShenZhen  ( shenzen with the en's very much the en in "hen").  I don't bother to put people right and I suspect it is a well known phenomenon to Chinese speakers 

So am I right is this a Chinese product that's made it here with a chinese name and if so which "zhu" is the name representing? possibly 侏？

Trevor