Frozen Tuna Front is the seventh stage in Sea of Tuna.
After 20 seconds, a Doge Dark, Duche, Celeboodle, Dagshund, St. Pigge the 2nd, Metal Hippoe, and Duche will spawn and respawn at a minute's pace. 3 Master As. spawn after 30 seconds, delayed around 100 seconds and Those Guys appear as peons after 40 seconds.
At the start of battle, spawn Macho Cat and Wall Cat, Dragon Cat and Doge Dark will die before Celeboodle arrives at the front. Spawn Bahamut Cat when St. Pigge the 2nd reach the front. After killing St. Pigge the 2nd, Spawn Sexy Legs Cat, Dragon Cat and Valkyrie Cat from the obtained money. Start spawning Dragon Cat and Sexy Legs Cat, but the player should save money for Bahamut Cat and Valkyrie Cat. The player can postpone the production of Dragon Cat and defeat the first Master A. before it overlaps. 
Strategy 2 (Luring with Bahamut)
Line-up: Macho Cat, Wall Cat, Sexy Legs Cat, Dragon Cat, Giraffe Cat, Mythical Titan Cat, Valkyrie Cat, Bahamut Cat
Notes: It is recommended to devolve Lion Cat if you have it to Giraffe due to better spammability.
Start off by spamming Macho Cats. This will cause the enemies to stack. When they are near your base, start spawning Wall Cats (continue to spawn Macho Cats too) and Bahamut Cat. Bahamut Cat should kill the horde. Now spam Giraffe Cats to chip off as much health as possible from the Metal Hippoe. Start spamming everything except Giraffe once Master A. starts attacking. Bahamut should kill the respawned supports while your Dragons and Mythical Titans kill Master A. when there is no Master A. try to push forward as best as you can, at this point you can start spamming Giraffes again. Repeat this process while replacing Valkyrie and Bahamut when they die.
Strategy 3 (Special Cats)
Before spawning a Bahamut Cat, spam Macho Cat, Boogey Cat, Wall Cat and Valkyrie Cat. Spawn Bahamut Cat. After Bahamut Cat's attacks, spawn Kung Fu Cat, Dragon Cat, Wall Cat. Produce Mr. and Giraffe Cat when Metal Hippoe comes out in front.
Strategy 4 (for 4 stars difficulty)
3 meatshields, Ramen Cat, Jurassic Cat, Cameraman Cat, Holy Valkyrie Cat, Ururun Cat, Paris Cat and Awakened Bahamut Cat.
First, do not spawn anything. When Celeboodles and Doge Darks get near, send your meatshields, ramen and Paris. Next, for the St Pigge, spawn Awakened Bahamut. Now spawn Jurassic Cat for Metal Hippoe. Awakened Bahamut should land a few hits on Master A (they should die in 3 hits.)