Peter Ladefoged transcribes it with the IPA symbol that is normally associated with the retroflex flap, ⟨ɽ⟩.
Wintu and Lardil are other languages with a reported (apico-)retroflex trill where the tongue apex "approaches" the hard palate, but it is not subapical, unlike in Toda.
Several languages have been reported to have trilled retroflex affricates such as [ɳɖ͡ɽ̝] and [ʈ͡ɽ̝̊], including Mapudungun, Malagasy and Fijian.
In Fijian, for example, further investigation has revealed that the sound (written ⟨dr⟩) is seldom trilled but is usually realized as a postalveolar stop [n̠d̠] instead.
The southern dialect varies between /ʈɽ/ and /ʈʂ/, but it is not clear whether the letter ⟨ɽ⟩ represents a trill or a non-sibilant fricative.