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Here is the verse of Bhagavata purana where Garga explains the colors of body of Vishnu in different incarnations.
Your son Kṛṣṇa appears as an incarnation in every millennium. In the past, He assumed three different colors — white, red and yellow — and now He has appeared in a blackish color. SB.10.8.13
I understand that in Krishna-avatar He was blackish but I don't know which other avatars He was white, red and yellow.
5th Chapter of 11th Canto of Srimad Bhagavatam describes white and red colors.
SB 11.5.21 — In Satya-yuga the Lord is white and four-armed, has matted locks and wears a garment of tree bark. He carries a black deerskin, a sacred thread, prayer beads and the rod and waterpot of a brahmacārī.
SB 11.5.22 — People in Satya-yuga are peaceful, nonenvious, friendly to every creature and steady in all situations. They worship the Supreme Personality by austere meditation and by internal and external sense control.
SB 11.5.23 — In Satya-yuga the Lord is glorified by the names Haṁsa, Suparṇa, Vaikuṇṭha, Dharma, Yogeśvara, Amala, Īśvara, Puruṣa, Avyakta and Paramātmā.
SB 11.5.24 — In Tretā-yuga the Lord appears with a red complexion. He has four arms, golden hair, and wears a triple belt representing initiation into each of the three Vedas. Embodying the knowledge of worship by sacrificial performance, which is contained in the Ṛg, Sāma and Yajur Vedas, His symbols are the ladle, spoon and other implements of sacrifice.
SB 11.5.25 — In Tretā-yuga, those members of human society who are fixed in religiosity and are sincerely interested in achieving the Absolute Truth worship Lord Hari, who contains within Himself all the demigods. The Lord is worshiped by the rituals of sacrifice taught in the three Vedas.
SB 11.5.26 — In Tretā-yuga the Lord is glorified by the names Viṣṇu, Yajña, Pṛśnigarbha, Sarvadeva, Urukrama, Vṛṣākapi, Jayanta and Urugāya.
As far as I know, except mentioning that Lord's avatar is yellow in color here and some other places like in Vishnu Saharsra nama. where 737th name is suvarnavarnah(He who is of golden color), there is no specific name associated with yellow colored incarnation.
God Rama was a Vishnu-avatara, born on Earth as the eldest son of King Dasharatha and Queen Kaushalya [Ref: Valmiki Ramayana 1.15].
God Rama was dark-skinned [Ref: Valmiki Ramayana 2.88; Brahmanda Purana 2.3.63.193; Vayu Purana 2.26.191].
Source: 'Essence of the Fifth Veda' by Gaurang Damani pgs 2-3
