Timing your Splash Dash so that you end right next to your target will give you a larger window of opportunity to damage your enemy with Tornado Move or the Bolt .45 Fish-gun.
Hammer Pants upgrade description explains that you must "aim at the ground to execute". In reality, the effect will occur if you hit any kind of terrain, including walls, ceilings and enemy turrets.
As a brawler, Froggy G excels in one versus one combat. Be sure to stick to your team and avoid being lined up as to make sure at least one team member avoids Splash Dash'sstun and is ready to punish him for it.
If Froggy G is using Right Back At Ya!, stop using attacks that can be reflected until it wears off. See a list of what can be reflected and what cannot here.