These are a few Yoshi skins that i downloaded from FPSBanana since i could not find them on Gmod.org i uploaded them and there are 5 reskins and as you can see they are differently coloured.
All content is not made by me all credit goes to their creators.
But thank Nintendo for creating Yoshi and we all love him.
This download looks like an addon. You need to extract the downloaded zip and put the addon folder in your Garry's Mod addons folder. You should end up with a directory structure similar to below:
Pariah's Yoshis <-- Addon folder!
- Pariah's Yoshis/
- Spawn Code.txt
tstorm31, ggbash913, Koopaboy6, Koopaboy6, Ivanandresmorales.morales.5, Xxeugene_101xX, Squiggles, suhhmanthu, gsherp05, andresdeleonpaniagua1997, chuyito09.jag, Change, VPG001, BradChasse, Sharena421, juansupermarco, Magmabone, xxExoP4ndaxx, yoshi_cape, Ms.PopGuM, xandealbuquerque, Yoshian12, Shadow, Fleet Admiral Tony