Frog is just crap. Obviously it's worthless outside of water, but even in water it's horribly limited, only possibly saved by being an actually working ride armor underwater and homing projectile attack. The "swimming" ability is wonky to control and very restricted in length/height/direction.
I don't see why they didn't just give it a swimming ability and leave it at that. It feels more clunky to control than Bitfrost, and that's pretty clunky! As Hyper said, the charged Frost Shield remedies this problem entirely, until you realize that the buster part is pure garbage, and now you're back at square one.
