No,
ἀλλὰ (alla)
Conjunction
Strong's Greek 235: But, except, however. Neuter plural of allos; properly, other things, i.e. contrariwise.

this
τοῦτό (touto)
Demonstrative Pronoun - Nominative Neuter Singular
Strong's Greek 3778: This; he, she, it.

is
ἐστιν (estin)
Verb - Present Indicative Active - 3rd Person Singular
Strong's Greek 1510: I am, exist. The first person singular present indicative; a prolonged form of a primary and defective verb; I exist.

what
τὸ (to)
Article - Nominative Neuter Singular
Strong's Greek 3588: The, the definite article. Including the feminine he, and the neuter to in all their inflections; the definite article; the.

was spoken
εἰρημένον (eirēmenon)
Verb - Perfect Participle Middle or Passive - Nominative Neuter Singular
Strong's Greek 2046: Probably a fuller form of rheo; an alternate for epo in certain tenses; to utter, i.e. Speak or say.

by
διὰ (dia)
Preposition
Strong's Greek 1223: A primary preposition denoting the channel of an act; through.

the
τοῦ (tou)
Article - Genitive Masculine Singular
Strong's Greek 3588: The, the definite article. Including the feminine he, and the neuter to in all their inflections; the definite article; the.

prophet
προφήτου (prophētou)
Noun - Genitive Masculine Singular
Strong's Greek 4396: From a compound of pro and phemi; a foreteller; by analogy, an inspired speaker; by extension, a poet.

Joel:
Ἰωήλ (Iōēl)
Noun - Genitive Masculine Singular
Strong's Greek 2493: Joel, the Hebrew prophet. Of Hebrew origin; Joel, an Israelite.


Additional Translations
No, this is what was spoken by the prophet Joel:

But this is that having been spoken by the prophet Joel:

But this is that which was spoken by the prophet Joel;

but this is that which hath been spoken through the prophet Joel:

but this is that which was spoken through the prophet Joel,

but this is that which hath been spoken by the prophet Joel;

But this is that which was spoken by the prophet Joel,

But that which was predicted through the Prophet Joel has happened:

But this is what has been spoken through the prophet Joel:

'But this is that which hath been spoken through the prophet Joel:Joel Predicted ProphetJoel Predicted ProphetActs 2:16 NIV
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Alphabetical: but by is Joel No of prophet spoken the this through was what

NT Apostles: Acts 2:16 But this is what has been spoken (Acts of the Apostles Ac) Bible Study Resources, Dictionary, Concordance and Search Tools