A similar fruit is kinkan - 金柑 "gold" and "citrus" - known as kumquat. Kinkan - Fortunella japonica or Citrus japonica - looks like a very small orange.
Even though loquat and kumquat are botanically unrelated, their names both originate in the same Cantonese word.
Photos of kinkan:
The length of this fruit is maximum 5cm.
While taking photos of the fruit in a garden, the owner noticed me and offered some.