Dog Dog Fruit model: Okuchi no Makami (Wano guardian deity)
Mythical Zoan
Passives:
Frost Walker (only in hybrid and beast forms)
Abilities:
Hybrid: Man-Beast transformation. Probably should be a full model seeing as Yamato looks super different. Strength and durability boost. Yamato stood up to Kaido in his hybrid transformation.
Walk point: beast transformation. Increase speed and slight strength (claws)
Mahoroba: Imbues weapon with a frosty aura. Freezes enemies on impact. Can be used in all forms including base (Yamato uses it in his normal form). Requires weapon.
Namuji Hyoga: after a short windup shoots a beam of ice breath. Dealing high damage and freezing on impact. Requires either hybrid or walk point
Himorogiri: leap into the air, spinning your weapon creating a swirl of ice. Bring your weapon down on your opponents head. Knocking them down for a very short duration and giving them frost slowness after they get up. Requires hybrid. Requires weapon
Kagamiyama: Covers user in a layer of ice unnoticeable by opponents. This ice will fully tank any hit aside from internal distraction ONCE. Then goes on cooldown for a long period. You can move freely after activation and it will last until you detransform or get hit. Requires either hybrid or walk point.
Notes:
Frost walker should be worse than Hie
Freezing should be much shorter than Hie