The eyes of tongueless frogs moves inwards to aid them swallowing. The DAF being so small this event is hard to see. So here is a close up slow motion clip of the action.

Care sheet of Dwarf African Frog – Hymenochirus boettgeri can be found here:
http://theaquariumwiki.com/DAF It is up to 12 cm long with a flattened head and body, but no external ear or tongue.