I found this topic over at the Saturday Morning Sonic forums.
The picture is of a promotional Sonic 1 figurine showing Ricky the Squirrel, only his fur is lighter, and he's a she, and his name is Sally Acorn.
I also found this article at Sonic HQ.
It looks like Sally Acorn is the official name of Ricky in America and Europe, and thus Sally is in Sonic 1, and predates Amy Rose by one year.
Also, the Article gives us all of the official names of the tiny animals in Sonic 1.