Yes, they're interchangeable here.
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AlpheccaStarsA teaspoon is the name of an eating implement. There are many types of spoons - teaspoon, tablespoon, soup spoon, serving spoon, etc.Thank you for your answer
HotmaleIs it natural to say "soupspoonful"? Does "ful" work with any type of spoon?Only the teaspoon and tablespoon are used as standard measures in recipes. So teaspoonful and tablespoonful are common. Spoonful is alsso common.