block cipher algorithms with variable block lengths
Rijndael-128, Rijndael-192 and Rijndael-256 are actually 3 different variants of block cipher that are very similar.

Simon, Speck, Threefish and RC5 also define different block size variants in similar way. Rijndael is not unique in this regard.

Block cipher that really has variable block length is XXTEA as its block length is not limited.