Commonly used in food contexts, especially for sweet chestnuts and confections like マロングラッセ (marron glacé).
from French marron
In autumn, cakes made with chestnuts are popular.
In autumn, many sweets made with chestnuts appear.
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.
In Australia, marron is treated as a luxury ingredient.
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.