Four historically significant baseball bats showcased in the National Baseball Hall of Fame's traveling exhibit "Baseball As America". From left to right: bat used by Babe Ruth to hit his 60th home run during the 1927 season, bat used by Roger Maris to hit his 61st home run during the 1961 season, bat used by Mark McGwire to hit his 70th home run during the 1998 season, and the bat used by Sammy Sosa for his 66th home run during the same season.
A fungo bat is a specially designed bat used by baseball and softball coaches for practice. The etymology of the word fungo ( /ˈfʌŋɡoʊ/) is uncertain, but the Oxford English Dictionary suggests it is derived from the Scots fung: to pitch, toss, or fling.[26] A fungo is longer and lighter than a regulation bat, with a smaller diameter. The bat is designed to hit balls tossed up in the air by the batter, not pitched balls.[27] Typical fungo bats are 35 to 37 inches (89 to 94 cm) long and weigh 17 to 22 ounces (480 to 620 g). Coaches hit many balls during fielding practice, and the weight and length allow the coach to hit balls repeatedly with high accuracy. The small diameter also allows coaches to easily hit pop-ups to catchers and infielders along with ground balls due to better control of the barrel of the bat.
Fungo bats are usually 36 or 37 inches long.  Due their thinner, lighter design, they are a very versatile tool for any coach. It is so much easier to hit hundreds of grounders and fly balls with a fungo than with a regular bat.  As well, with the prices of today’s top end bats, a $35 fungo makes more sense. Don’t dent the $350 war clubs in your bat bag.
The most obvious reasons to utilize a fungo bat is the fact that it’s lightweight. It’s handy to coaches when conducting fielding practice since he or she has to hit plenty of balls to warm up his or her players. What is for sure is that hitting countless balls during practice can be tiring. Consequently, having a bat that’s lighter weight is magical at preventing the coach and/or players from getting tired.
There are many advantages to using a fungo bat. If you are a coach or a parent looking to improve your player's defensive skill set, you're going to want and need a fungo bat. A normal adult wooden baseball bat will weigh around 27-31 ounces, and after a couple of rounds of pop-flys, it is going to feel like you just went through a full-on workout. With the help of a fungo bat, you will be able to hit ground balls and pop flys all day without getting fatigued.  The barrel on a fungo bat will typically be 2 1/4 inches in diameter which greatly helps increase your control over the bat through the hitting zone. While the barrel has a much more thin diameter, it is also much longer in comparison to a normal wood baseball bat. This larger hitting surface and smaller barrel combine to give coaches and parents quick swing speeds with precise accuracy. 
Four historically significant baseball bats showcased in the National Baseball Hall of Fame's traveling exhibit "Baseball As America". From left to right: bat used by Babe Ruth to hit his 60th home run during the 1927 season, bat used by Roger Maris to hit his 61st home run during the 1961 season, bat used by Mark McGwire to hit his 70th home run during the 1998 season, and the bat used by Sammy Sosa for his 66th home run during the same season.
For starters, we should clarify just what we’re talking about when we say fungo bat. Longer, lighter and thinner than a regulation bat (but a larger barrel), a fungo bat is typically 35 to 37 inches long, and weighs between 17 and 22 ounces. As David Allison wrote in the June 1978 edition of Country Journal, “A fungo bat looks to be a cross between a baseball bat and a broomstick.”
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