Rig Veda II.10.6 says
जञेया भागं सहसानो वरेण तवादूतासो मनुवद वदेम | अनूनमग्निं जुह्वा वचस्या मधुप्र्चं धनसाजोहवीमि ||
jñeyā bhāghaṃ sahasāno vareṇa tvādūtāso manuvad vadema | anūnamaghniṃ juhvā vacasyā madhupṛcaṃ dhanasājohavīmi ||
By choice victorious, recognize thy portion: with thee for envoy may we speak like Manu. Obtaining wealth, I call on perfect Agni who with an eloquent tongue dispenses sweetness.
A reference to Manu was made in the above Rig Vedic mantra. It talks about Manu praising AGNI.
Rig Veda II.20.7 says
sa vṛtrahendraḥ kṛṣṇayonīḥ purandaro dāsīrairayad vi | ajanayan manave kṣāmapaśca satrā śaṃsaṃ yajamānasya tūtot ||
Indra the Vṛtra-slayer, Fort-destroyer, scattered the Dāsa hosts who dwelt in darkness. For Manu hath he created earth and waters, and ever helped the prayer of him who worships.
This Mantra says Indra created Earth and waters for Manu.
However, it is not clear whether the Manu being referred to in these mantras, was the same Manu, who was eulogised to be the first man (progenitor of humanity) on the Earth or someone else.
Can someone clarify?