Yoshi Frame Traps

Text Version (from https://smashboards.com/threads/yoshi-combos-traps-and-kill-setups.435754/):

Uair Frame Trap
If the opponent is above you in the air, you can throw a Uair at them. If they don't airdodge, they get hit by it. If they do airdodge, you can Nair them.

Egg Toss Frame Trap (Fair)
In the air, throw a weak forward tossed egg while the opponent is also in the air. If they airdodge it, Fair them. If they get hit, Fair them anyway. Can give you a spike offstage.

Egg Toss Frame Trap (Uair)
If the opponent is directly above you, toss an egg at them. If they air dodge it, Uair them. If they get hit, double jump Uair. If you don't have a second jump, get back onstage quickly so you're still at the advantage.

Egg Toss Trap (ground)
In the air, throw a weak forward tossed egg (i.e. aim forward, but don't hold the Special button). If the opponent blocks it, you can Egg Lay them while they're in shield hitstun, or Fair them if they get hit. Note that they can still roll away. (see the extra note in the video description!)

Fair Frame Trap
In the air, throw out a Fair. If the opponent air dodges, you can hit them with a Nair. Otherwise, they get hit by the Fair.

Video description:
Yeah, the footage is pretty terrible, but it took forever to get even these clips, sadly. It's been brought to my attention (yay Yoshi Discord) that Egg Toss to Egg Lay (Up B to Neutral B) on shield won't actually be guaranteed. Instead, either B-reverse or wavebounce Egg Toss -- this will make Yoshi follow the egg more closely so that the opponent will still be stuck in shieldstun while you Egg Lay them. I still need to test this for myself, but I'm pretty sure it's true.