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Hi, I have learnt that $T_1$ is the relaxation time for excitation and $T_2$ is the decoherence time, how about dephasing? Say I register multiple qubits (not ideal and have variations between them, but $T_1$ and $T_2$ are both infinity for all of them) with the same info and try to retrieve information from them later. Obviously after some time the information stored within them would be different because they oscillate at slightly different frequencies. Is there a $T_?$ to characterize that (dephasing)?

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In fact, T1 only involves decay, which is due to the unstability of qubit energy. It’s fixed for a qubit.
While T2 involves decay and dephasing, Another name is decoherent time.
Considering your question, I am not clear about your question. What do you mean by oscillating in different frequency? ‘Oscillate’ is used for describing qubit transition. ‘Rotate’ is used for qubit’s relaxed evolution. Do you mean ‘rotate’?