Sprites are quite hard to do especially when they require conversion. The Zuma Blitz Spirit Turtle is no exception to this rule.
The turtle's more than capable of spitting out more fireballs than any other. That means more curve clears on shorter boards. It might be expensive but it's responsible for almost 30M scores because players were exploiting the combo system by racking up combos while remaining in hot frog mode.
Of course to get these it's highly dependent on luck; you have to rely on fruit appearing faster than usual and balls appearing in a favorable position. Attempting these scores alone has zeroed my coin balance many times over, and put high coin costs on other players (I think it took someone many attempts and around 30 million coins to achieve the first 29m score).
I didn't record any replays after the Shamrock board since high scores were determined by abusing game bugs and I don't want to promote that.
(A direct color conversion of the Spirit Turtle makes it look janky in some areas and will be redesigned. Expect an updated image in the next few days.)