Yes, Yoho Mobile sells unlimited‑data eSIM plans for Madagascar under the name Global F Unlimited. The plans come in validity periods ranging from 1 day to 30 days and their prices span from $15.69 USD for a 1‑day pass to $449.07 USD for a 30‑day pass. Each plan allows tethering, may be throttled, and lists a maximum speed of 5000 kbps, which represents the normal speed before any Fair Usage Policy limits are applied.
Because speeds can be reduced after heavy use, it is advisable to contact Yoho Mobile directly if you want confirmation that the data will remain at normal speed for the duration of your stay, or if you have concerns about the Fair Usage Policy thresholds.