Is crowed a noun

No, the Word 'crowed' is the past participle, past tense of the verb to crow (crows, crowing, crowed). The past participle of the verb is also an adjective (a crowed alarm).

The Word crow (crows) is a noun, a Word for a type of bird and a Word for the cry of a bird.

The noun forms for the verb to crow are crower (a person or bird that crows) and the gerund, crowing.