apple
Tomato sauce is not a compound word.
Hotsauce
The word is spelled pineapple. It is a compound word made from pine+apple.
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You have spelled it correctly, pineapples. The name comes from "pine" and "apple", forming a compound word. (Originally what are now called pine cones were called pine apples or pineapples, and the similar appearance of the fruit led to the name.)
sauce - source
No, "crab" is not a long vowel word. The letter 'a' in "crab" makes a short vowel sound, as in the word "bat."
pine = piña
In French, the word "sauce" is feminine.
The compound noun 'baked beans' is an uncountable noun as a word for a substance, a type of food. The noun 'beans' is a the plural form of the noun 'bean'. One baked bean is not a meal or a serving. The compound noun 'baked beans' is a word for beans baked or simmered in a sauce.
Soy sauce is two words. This is the normal pattern when the first word describes the kind of sauce: barbecue sauce, horseradish sauce, hot sauce. An exception is applesauce, which is one word.
केकड़ा is the word crab in Hindi.