As an expert in linguistics and cultural studies, I can provide you with an answer to your question. The term "maltesters" does not seem to be a recognized term in the United States or in standard English. It's possible that there may be a spelling error or a misunderstanding of the term you're referring to.
If you're referring to "maltsters," which are individuals or companies involved in the process of making malt, a key ingredient in brewing beer, then yes, there are maltsters in the United States. The United States has a thriving craft beer industry, and with it, a number of maltsters who supply malt to breweries.
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