>>55621760>>55621778Bulbapedia seems to have some information in the Japanese part of the names section on each berry page
Chesto berries are apparently based on Dioscorea bulbifera, a kind of yam
Leppa berries are Malus prunifolia, a kind of crab apple
Kelpsy berries are specifically based on kombu, a kind of kelp
Cornn is apparently based on sorghum
and Sitrus berry is a pomelo
There's also some interesting ones for different languages. In Hindi, for example, Pecha berries are named after turnips