There is a voice changer app on play stor u can download it from there

Check out "Voice Changer" https://play.google.com/store/apps/details?id=com.androidrocker.voicechanger

VOICE CHANGER - AUDIO EFFECTS V1.0.6 [PRO].apk https://play.google.com/store/apps/details?id=studio.onepixel.voicechanger Change your voice and have fun! Record your voice and apply cool realistic effect via Voice Changer. The program is easy to use and can produce great sound effects and great fun! Voice is recorded in very high quality. Record voice or open a sound, apply effects, and share them with your friends. FEATURES: • More than 25 effects: robot, alien, zombie, helium, drunk, chipmunk, death, cave, underwater, devil, telephone, swirl, fan, ... and many more! • Import audio files • Create voice from text • Share recordings via different apps • Save recordings • Set as ringtone • Set as notification sound • Set as alarm • Save as mp3 or wav • Simple and intuitive interface • Futuristic design Mod Info: Pro Features Unlocked. @hafblackteach

Audacity for PC