Yes! You get a Daily Wheel Spin every 24 hours for a chance to earn Bowling Balls so be sure to login each day!
There are also tons of free ways to get Bowling Balls over in the Action Feed in verybowling. If you tap on the bottom-left icon on the Play screen, you'll be able to watch videos, do surveys, complete offers, and more all for free Bowling Balls. Sometimes it can take up to 24 hours for a Bowling Ball to appear, but they'll always show up in your Inbox tab so make sure to check there.