Holly does this too!It’s not actually brilliant when there are distractions or she’s tired, but what is funny is if you say ‘What’s this?’ she comes running!! I blame my dad a little because he asks her to come without giving her anything (he doesn’t seem to get the fact that she’s still a puppy sometimes) but when we say ‘What’s this?’ it’s always a bit of dropped food or a new toy or something – think that may be our new recall word J lol
At home I often use "What's this?" to call her. I usually use it when I need to call her from the other room where I can hear her being naughty but can't be bothered getting a treat or going to get her (basically when I'm being lazy) so I just call "What's this?" and pick up one of her toys or a bit of paper to present her with when she gets to me. I don't mind if she ignores the "What's this?" cue either since I never use it out of the house and it wont ruin her actual recall cue ("Holly, come") if she is being too naughty to come or if she doesn't get rewarded.
Another recall cue that she has learn't is "Tilly! come and sit on my knee!", Tilly is our cat and Holly hates it when she sits on me and anoys her until she gets off. Tilly is allowed to sit on everyone else, just not me. Holly's technique to get her off is usually to lick her ears until Tilly gets sick of it so she doesn't actually hurt the cat (and Tilly is bigger than Holly anyway)