* English: This is the most likely language he spoke fluently, as he was born and raised in England.
* Latin: As a well-educated man of his time, it's likely he also knew Latin, which was the academic language of the time.
* Possibly some French: Frobisher spent time in France, and it's possible he picked up some French. However, it's unlikely he was fluent.
* Likely no Inuit: It's highly doubtful that he spoke any Inuit languages, as these were not commonly known in England at the time, and his interactions with Inuit people were primarily focused on trade and exploration.
Therefore, while we can't be certain, it's safe to assume that Martin Frobisher spoke English and Latin as his primary languages. He may have known a bit of French, but it's highly unlikely he spoke any Inuit languages.