This is the 12750th most frequent Russian word.
креветок
"Креветок" means "shrimp" (genitive plural form) in English.
The word 'креветок' is used here in the genitive plural form to indicate quantity (kilogram is the measured amount).
Я купил килограмм креветок для ужина.
I bought a kilogram of shrimp for dinner.
The word 'креветок' is in the genitive plural form, describing 'много' (many), as Russian uses this grammatical structure for quantities.
На пляже мы нашли много маленьких креветок.
On the beach, we found many small shrimp.
The word 'креветок' is in the genitive plural case, complementing the word 'вкус' (taste), which requires the genitive for its object.