Would not give raw meat to frog; it's not their natural diet. Raw fish rated for human consumption is OK; but only the whole fish matches natural diet. Can get small frozen feeder fish at pet shop or at some oriental food markets. Currently available small feeder fish contain a hazardous enzyme called Thiaminase which causes vitamin B1 deficiency. Because of that, recommend only feed one small (couple in.) frozen fish to your frog per week.

Frogs do not feel lonely. During breeding season they will look for a mate to breed; but not because of loneliness. Can you please describe tank (post pic too) to see if we can pinpoint why is frog hiding. Good luck !