"Mouthful." A crusty roll, a sort of sandwich, split and sprinkled inside with olive oil, often filled with ham and cheese. In Colombia this may be a sweet.
"Nun's mouthful." A small cake made with almonds, sugar and eggs.
"Little mouthfuls." Small sandwiches with various fillings, sometimes sweet, often found in the Caribbean.
Savoury titbits, often based on cheese. They can be served at the end of a meal or as an appetiser.