Here is a list of verbs that start with BLA.
blabbed, black, blacked, blackened, blackmailed
blame, blamed, blaming, blanched, blanching
blanket, blanketed, blankets, blared, blaring
blasphemed, blast, blasted, blasting, blaze
blazed, blazing, blazon
Hope you enjoy this page of verbs that start with bla and the rest of this verb list site as well.
Did I miss any verbs? Visitors can make this a more useful online resource by listing more verbs in the comments.