The correct term is myrmecophage, always with a tilde. It means that it feeds exclusively on ants. Who practices myrmecophagia (custom of feeding on ants, who prefers to eat ants).
A mirmecofago is an animal which feeds exclusively or mostly ants and, frequently, also termite ( while they are not ants ). As the customs of the ants and termites are similar, the adaptations required for consumption are similar.