According to the folks on the podcast No Such Thing as a Fish, it’s a learned behavior. My 11 year old son has started mimicking my husband’s ridiculous sneezes and his voice hasn’t even dropped yet so… yeah might be.
No, at least for some people they can control it. I told my loud sneezing husband who "couldn’t help it " if his sneeze woke the child, the child was his responsibility alone to care for and he found a way to sneeze normally.