Commonly used in food contexts, especially for sweet chestnuts and confections like マロングラッセ (marron glacé).
from French marron
秋になると、マロンを使ったスイーツがたくさん出回る。
In autumn, many sweets made with chestnuts appear.
In autumn, cakes made with chestnuts are popular.
このケーキにはマロンクリームがたっぷり入っている。
This cake is filled with plenty of chestnut cream.
marron crayfish
Refers to two species of Australian freshwater crayfish (Cherax tenuimanus and Cherax cainii), often encountered in fishing or culinary contexts.
オーストラリアではマロンは高級食材として扱われる。
In Australia, marron is treated as a luxury ingredient.
母は器用にマロンを剥いていた。
My mother was skillfully peeling the chestnuts.
マロン (chestnut) is typically counted with 個 for a whole nut.
マロン (chestnut) can also be counted with 粒 when referring to small, individual nuts, especially in confectionery.
Borrowed from French 'marron' (chestnut). The crayfish sense is an extended use from the same French word, likely due to the chestnut-like color of the species.