I don't understand how to interpret your statement.
For griffons, their native land is grass; they get +1 to morale there, and it's very likely to be present. However, in the metro, it's more of an exception; morale might actually be higher for troglodytes, as it's their native land, and they get +1 to speed, which, combined with the miner skill, gives troglodytes a speed advantage over griffons. That's what I meant!