狸のボール

Remember the Tanuki suit from Super Mario Bros. 3? Of course you do.
Were you confused about it? Of course you were.
Will reading the following only serve to confuse you a lot more than you anticipated? Well…

Statues of tanuki can be found outside many Japanese temples and restaurants, especially noodle shops. These statues often wear big, cone-shaped hats and carry bottles of sake in one hand, and a promissory note or empty purse in the other hand. Tanuki statues always have large bellies. The statues also usually show humorously large testicles, typically hanging down to the floor or ground, although this feature is sometimes omitted in contemporary sculpture.
Wikipedia

Now consider:

Tan-tan-tanuki’s testicles, there isn’t even any wind but still go swing-swing-swing.Japanese Schoolyard Rhyme, translated