There are a few dolls in Rachel's house who sport watermelon themed fashion. The one pictured below has a complete ensemble. Headdress, dress, and market bag.
This wooden puppet doll isn't dressed in watermelon, but by pulling her puppet strings she can be made to eat her slice of melon.
And finally, the doll below got so excited about her melon that she seems to have sprouted right out of a slice.