Yes. An L-2 spouse is employment-authorized incident to status, so he may take a job in any field once admitted, without needing a separate work permit. He is not limited to agriculture and is not tied to the petitioning company.
The L-2 spouse's authorization is broad and not job-specific
Employment authorization incident to status means the husband's lawful admission in L-2 status is itself the permission to work; USCIS updated its policy to that effect, and admission records annotated for L-2 spouses serve as evidence for employment verification. He does not need to work for the U.S. subsidiary, in food processing, or in any role related to her assignment. He may also obtain an employment-authorization document for convenience, though it is not required. The authorization lasts only while his L-2 status lasts, so if her L-1B ends early, so does his right to work. Children admitted in L-2 status are different: they may attend school but cannot work, and their status ends at twenty-one or when they marry. A Kent family should also remember that L-2 status is derivative, so the husband cannot remain in the United States on it if the principal returns to Canada.
Hypothetical example: an optical-coatings specialist transfers with a spouse who plans to accept freelance design assignments after arrival. The first review confirms the spouse's admission classification and saves the record an employer or client may need for verification. The principal's specialist-knowledge case does not itself authorize a child's work, and family members must keep their own travel and status documents current. Build these dates into the relocation schedule before contracts are signed.