Croakley has slow movement speed (3) with a long attack range (900), his area of effect is also far away (1100~1400). His attack power is not so high. but it guarantees Slow effect to all cats for a minute, which may as well be death for units that aren't immune. However, he cannot hit cats in his (rather large) blind spot.
Since Croakley moves faster than The Face, it can be dealt with in its debut stage using Awakened Bahamut and Doctor Cat. Simply lure Croakley close to the Cat Base, unleash A. Bahamut (preferably with support from Manic Island Cat), and spam Doctor Cat. With luck, A. Bahamut will do enough damage to knock back Croakley several times, then Doctor Cat will move The Face out of the way, opening the path for A. Bahamut to finish Croakley off.
"eSports pro famous for rage-quitting during tournaments by using his tongue to hit the reset button. Guess that's one way to maintain a perfect win-loss ratio..."