The small girl in front of Buzz's dorm is missing her fish doll.
Look at the top of the fish shop. The doll is there, on top of the sign.
For Buzz, yes. But for Kitteh, not. Use Kitteh on the fish doll.
Not at this point. You have to move forward. Get inside the house on Christopher Valiant Street to talk to Voodoo Gentleman. After that try to get to Fishmouth.
You will, at some point, need to get a doll. Now Kitteh will help you fetch the fish doll.