Consonants with the tip of the tongue curled back against the palate are called retroflex.
[1] The nasal [ɲ] is also common, occurring in around 35 percent of the world's languages,[2] in most of which its equivalent obstruent is not the stop [c], but the affricate [t͡ʃ].
Only a few languages in northern Eurasia, the Americas and central Africa contrast palatal stops with postalveolar affricates—as in Hungarian, Czech, Latvian, Macedonian, Slovak, Turkish and Albanian.
However, phonetically speaking, the Spanish one is simultaneous alveolo-palatal and dento-alveolar or dento-alveolo-palatal[4] while the Russian soft one is alveolopalatal laminal (except for /rʲ/ which is apical with a secondary articulation).
(On the other hand, Spanish speakers can be careful to pronounce /nj/ as two separate sounds to avoid possible confusion with /ɲ/.)