Every character on Jiǎoluò Shūwū read as tu in any tone — 2 readings total across the four tones. Pick the tone you mean.
If you have the sound tu but not the character, here are the 2 characters read this way: 图 (tú, map, diagram, to plan, to seek), 土 (tǔ, earth, soil, local, native). They split across 2 tones, so the tone is what separates them.