n. 小赠品

[法] 免费赠品, 商人给顾客的小赠品

[ noun ]
a small gift (especially one given by a merchant to a customer who makes a purchase)
<noun.possession>

Lagniappe \La*gniappe\, Lagnappe \La*gnappe"\, n. [Also spelled
{lagnappe}.][Etym. uncertain.]
1. In Louisiana, a trifling present given to customers by
tradesmen; a gratuity.

Lagniappe . . .is something thrown in, gratis, for
good measure. --Mark Twain.
[Webster 1913 Suppl.]

2. A tip or gratuity.
[PJC]

3. Hence: Anything obtained gratuitously or unexpectedly.
[PJC]